+}
+
+@inproceedings{ref156,
+ author = {F. Pedraza and A. L. Medaglia and A. Garcia},
+ title = {Efficient coverage algorithms for wireless sensor networks},
+ booktitle = {Proceedings of the 2006 Systems and Information Engineering Design Symposium},
+ pages = {78-83},
+ YEAR = {2006},
+}
+
+@book{ref157,
+ title={Handbook of sensor networks: algorithms and architectures},
+ author={Stojmenovic, Ivan},
+ volume={49},
+ year={2005},
+ publisher={John Wiley \& Sons}
+}
+
+@ARTICLE{ref158,
+author = {A. Varga},
+title = {OMNeT++ Discrete Event Simulation System},
+journal = {Available: http://www.omnetpp.org},
+year = {2003},
+}
+
+@inproceedings{ref159,
+ title={Coverage and Lifetime Optimization in Heterogeneous Energy Wireless Sensor Networks},
+ author={Idrees, Ali Kadhum and Deschinkel, Karine and Salomon, Michel and Couturier, Rapha{\"e}l},
+ booktitle={ICN 2014, The Thirteenth International Conference on Networks},
+ pages={49--54},
+ year={2014}
+}
+
+@article{ref160,
+ title={Transforming Area Coverage to Target Coverage to Maintain Coverage and Connectivity for Wireless Sensor Networks},
+ author={Deng, Xiu and Yu, Jiguo and Yu, Dongxiao and Chen, Congcong},
+ journal={International Journal of Distributed Sensor Networks},
+ volume={2012},
+ year={2012},
+ publisher={Hindawi Publishing Corporation}
+}
+
+@inproceedings{ref161,
+ title={Algorithms for node clustering in wireless sensor networks: A survey},
+ author={Kumarawadu, Priyantha and Dechene, Dan J and Luccini, Marco and Sauer, Allan},
+ booktitle={Information and Automation for Sustainability, 2008. ICIAFS 2008. 4th International Conference on},
+ pages={295--300},
+ year={2008},
+ organization={IEEE}
+}
+
+@ARTICLE{glpk,
+author = {Andrew Makhorin},
+title = {The GLPK (GNU Linear Programming Kit)},
+journal = {Available: https://www.gnu.org/software/glpk/},
+year = {2012},
+}
+
+@techreport{Idrees2,
+ author = {Idrees, Ali Kadhum and Deschinkel, Karine and Salomon, Michel and Couturier, Rapha{\"e}l},
+ institution = {University of Franche-Comte - FEMTO-ST Institute, DISC Research Department},
+ title = {Distributed Lifetime Coverage Optimization Protocol in Wireless Sensor Networks},
+ number = {DISC2014-X},
+ month = {Octobre},
+ year = {2014}
+}
+
+@article{0031-9155-44-1-012,
+ author={Eva K Lee and Richard J Gallagher and David Silvern and Cheng-Shie Wuu and Marco Zaider},
+ title={Treatment planning for brachytherapy: an integer programming model, two computational approaches and experiments with permanent prostate implant planning},
+ journal={Physics in Medicine and Biology},
+ volume={44},
+ number={1},
+ pages={145},
+ url={http://stacks.iop.org/0031-9155/44/i=1/a=012},
+ year={1999}
+}
+
+@BOOK{AMPL,
+ AUTHOR = "Robert Fourer and David M. Gay and Brian W. Kernighan",
+ TITLE = "AMPL: A Modeling Language for Mathematical Programming",
+ PUBLISHER = "Cengage Learning",
+ YEAR = "November 12, 2002",
+ edition = "2nd",
+
+}
+
+
+@inproceedings{ref162,
+ title={Maximizing the functional lifetime of sensor networks},
+ author={Giridhar, Arvind and Kumar, PR},
+ booktitle={Proceedings of the 4th international symposium on Information processing in sensor networks},
+ pages={2},
+ year={2005},
+ organization={IEEE Press}
+}
+
+@inproceedings{ref163,
+ title={Using mobile relays to prolong the lifetime of wireless sensor networks},
+ author={Wang, Wei and Srinivasan, Vikram and Chua, Kee-Chaing},
+ booktitle={Proceedings of the 11th annual international conference on Mobile computing and networking},
+ pages={270--283},
+ year={2005},
+ organization={ACM}
+}
+
+@article{ref164,
+ title={Investigating a wireless sensor network optimal lifetime solution for linear topologies},
+ author={Hellman, Keith and Colagrosso, Michael},
+ journal={Journal of Interconnection Networks},
+ volume={7},
+ number={01},
+ pages={91--99},
+ year={2006},
+ publisher={World Scientific}
+}
+
+
+@article{ref165,
+ title={Scheduling sleeping nodes in high density cluster-based sensor networks},
+ author={Deng, Jing and Han, Yunghsiang S and Heinzelman, Wendi B and Varshney, Pramod K},
+ journal={Mobile Networks and Applications},
+ volume={10},
+ number={6},
+ pages={825--835},
+ year={2005},
+ publisher={Springer-Verlag New York, Inc.}
+}
+
+
+
+
+@inproceedings{ref167,
+ title={Energy-efficient target coverage in wireless sensor networks},
+ author={Cardei, Mihaela and Thai, My T and Li, Yingshu and Wu, Weili},
+ booktitle={INFOCOM 2005. 24th Annual Joint Conference of the IEEE Computer and Communications Societies. Proceedings IEEE},
+ volume={3},
+ pages={1976--1984},
+ year={2005},
+ organization={IEEE}
+}
+
+@article{ref168,
+ title={Maintaining sensing coverage and connectivity in large sensor networks},
+ author={Zhang, Honghai and Hou, Jennifer C},
+ journal={Ad Hoc \& Sensor Wireless Networks},
+ volume={1},
+ number={1-2},
+ pages={89--124},
+ year={2005},
+ publisher={vol}
+}
+
+@article{ref169,
+ title={Lightweight deployment-aware scheduling for wireless sensor networks},
+ author={Wu, Kui and Gao, Yong and Li, Fulu and Xiao, Yang},
+ journal={Mobile networks and applications},
+ volume={10},
+ number={6},
+ pages={837--852},
+ year={2005},
+ publisher={Springer}
+}
+
+@article{ref170,
+ title={Redundancy and coverage detection in sensor networks},
+ author={C{\u{a}}rbunar, Bogdan and Grama, Ananth and Vitek, Jan and C{\u{a}}rbunar, Octavian},
+ journal={ACM Transactions on Sensor Networks (TOSN)},
+ volume={2},
+ number={1},
+ pages={94--128},
+ year={2006},
+ publisher={ACM}
+}
+
+@inproceedings{ref171,
+ title={On sensor network lifetime and data distortion},
+ author={Kansal, Aman and Ramamoorthy, Aditya and Srivastava, Mani B and Pottie, Gregory J},
+ booktitle={Information Theory, 2005. ISIT 2005. Proceedings. International Symposium on},
+ pages={6--10},
+ year={2005},
+ organization={IEEE}
+}
+
+
+@inproceedings{ref172,
+ title={On the lifetime analysis of always-on wireless sensor network applications},
+ author={Kumar, Santosh and Arora, Anish and Lai, Ten-Hwang},
+ booktitle={Mobile Adhoc and Sensor Systems Conference, 2005. IEEE International Conference on},
+ pages={3--pp},
+ year={2005},
+ organization={IEEE}
+}
+
+
+@article{ref174,
+ title={Lifetime analysis of reliable wireless sensor networks},
+ author={Baydere, Sebnem and Safkan, Yasar and Durmaz, Ozlem},
+ journal={IEICE transactions on communications},
+ volume={88},
+ number={6},
+ pages={2465--2472},
+ year={2005},
+ publisher={The Institute of Electronics, Information and Communication Engineers}
+}
+
+
+@inproceedings{ref175,
+ title={Mostly-sleeping wireless sensor networks: connectivity,
+k-coverage, and alpha-lifetime.},
+ author={MO, W. and QIAO, D. and WANG, Z.},
+ booktitle={In Proceedings of the the 43rd Annual Allerton Conference on
+Communication, Control, and Computing},
+ pages={1--12},
+ year={2005}
+}
+
+
+@inproceedings{ref177,
+ title={A survey of simulators, emulators and testbeds for wireless sensor networks},
+ author={Imran, Muhammad and Said, Abas Md and Hasbullah, Halabi},
+ booktitle={Information Technology (ITSim), 2010 International Symposium in},
+ volume={2},
+ pages={897--902},
+ year={2010},
+ organization={IEEE}
+}
+
+@INPROCEEDINGS{ref178,
+author={Steyn, L.P. and Hancke, G.P.},
+booktitle={AFRICON, 2011},
+title={A survey of Wireless Sensor Network testbeds},
+year={2011},
+month={Sept},
+pages={1-6},
+keywords={wireless sensor networks;laboratory testbeds;real world deployments;wireless sensor network;Hardware;Mobile communication;Servers;Software;Universal Serial Bus;Wireless communication;Wireless sensor networks},
+doi={10.1109/AFRCON.2011.6072072},
+ISSN={2153-0025},}
+
+
+@inproceedings{ref179,
+ title={Limitations of simulation tools for large-scale wireless sensor networks},
+ author={Khan, Muhammad Zahid and Askwith, Bob and Bouhafs, Faycal and Asim, Muhammad},
+ booktitle={Advanced Information Networking and Applications (WAINA), 2011 IEEE Workshops of International Conference on},
+ pages={820--825},
+ year={2011},
+ organization={IEEE}
+}
+
+@inproceedings{ref180,
+ title={On the accuracy of omnet++ in the wireless sensornetworks domain: simulation vs. testbed},
+ author={Colesanti, Ugo Maria and Crociani, Carlo and Vitaletti, Andrea},
+ booktitle={Proceedings of the 4th ACM workshop on Performance evaluation of wireless ad hoc, sensor, and ubiquitous networks},
+ pages={25--31},
+ year={2007},
+ organization={ACM}
+}
+
+@inproceedings{ref181,
+ title={Motelab: A wireless sensor network testbed},
+ author={Werner-Allen, Geoffrey and Swieskowski, Patrick and Welsh, Matt},
+ booktitle={Proceedings of the 4th international symposium on Information processing in sensor networks},
+ pages={68},
+ year={2005},
+ organization={IEEE Press}
+}
+
+@article{ref182,
+ title={Wireless sensor networks testbeds and state-of-the-art multimedia sensor nodes},
+ author={Farooq, Muhammad Omer and Kunz, Thomas},
+ journal={Appl. Math. Inf. Sci},
+ volume={8},
+ pages={935--940},
+ year={2014}
+}
+
+@incollection{ref183,
+ title={WISEBED: an open large-scale wireless sensor network testbed},
+ author={Chatzigiannakis, Ioannis and Fischer, Stefan and Koninis, Christos and Mylonas, Georgios and Pfisterer, Dennis},
+ booktitle={Sensor Applications, Experimentation, and Logistics},
+ pages={68--87},
+ year={2010},
+ publisher={Springer}
+}
+
+@article{ref184,
+ title={FIT IoT-LAB tutorial: hands-on practice with a very large scale testbed tool for the Internet of Things},
+ author={Fambon, O and FLEURY, {\'E}RIC and Harter, G and Pissard-Gibollet, R and Saint-Marcel, F},
+ journal={10{\`e}mes journ{\'e}es francophones Mobilit{\'e} et Ubiquit{\'e}, UbiMob2014},
+ year={2014}
+}
+
+@misc{ref185,
+ title = {The IoT-LAB. [online],https://www.iot-lab.info.},
+
+}
+
+
+@article{ref186,
+ title={A Survey on Testbeds and Experimentation Environments for Wireless Sensor Networks},
+ author={Horneber, Jens and Hergenroder, A},
+ year={2014},
+ publisher={IEEE}
+}
+
+
+@inproceedings{ref187,
+ title={Kansei: a testbed for sensing at scale},
+ author={Ertin, Emre and Arora, Anish and Ramnath, Rajiv and Naik, Vinayak and Bapat, Sandip and Kulathumani, Vinod and Sridharan, Mukundan and Zhang, Hongwei and Cao, Hui and Nesterenko, Mikhail},
+ booktitle={Proceedings of the 5th international conference on Information processing in sensor networks},
+ pages={399--406},
+ year={2006},
+ organization={ACM}
+}
+
+@article{ref188,
+ title={Wireless sensor network simulators a survey and comparisons},
+ author={Sundani, Harsh and Li, Haoyue and Devabhaktuni, Vijay and Alam, Mansoor and Bhattacharya, Prabir},
+ journal={International Journal of Computer Networks},
+ volume={2},
+ number={5},
+ pages={249--265},
+ year={2011}
+}
+
+@article{ref189,
+ title={Survey of simulators for wireless sensor networks},
+ author={Musznicki, Bartosz and Zwierzykowski, Piotr},
+ journal={International Journal of Grid and Distributed Computing},
+ volume={5},
+ number={3},
+ pages={23--50},
+ year={2012}
+}
+
+@article{ref190,
+ title={Modeling and simulation of networked low-power embedded systems: a taxonomy},
+ author={Du, Wan and Mieyeville, Fabien and Navarro, David and O’Connor, Ian and Carrel, Laurent},
+ journal={EURASIP Journal on Wireless Communications and Networking},
+ volume={2014},
+ number={1},
+ pages={1--12},
+ year={2014},
+ publisher={Springer}
+}
+
+@misc{ref191,
+ title = {The Network Simulator - ns-2. [online],http://www.isi.edu/nsnam/ns/.},
+}
+
+@article{ref192,
+ title={Network modelling and simulation tools},
+ author={Rahman, Muhammad Azizur and Pak{\v{s}}tas, Algirdas and Wang, Frank Zhigang},
+ journal={Simulation Modelling Practice and Theory},
+ volume={17},
+ number={6},
+ pages={1011--1031},
+ year={2009},
+ publisher={Elsevier}
+}
+
+
+@inproceedings{ref193,
+ title={ns-3 project goals},
+ author={Henderson, Thomas R and Roy, Sumit and Floyd, Sally and Riley, George F},
+ booktitle={Proceeding from the 2006 workshop on ns-2: the IP network simulator},
+ pages={13},
+ year={2006},
+ organization={ACM}
+}
+
+@inproceedings{ref194,
+ title={FlowMonitor: a network monitoring framework for the network simulator 3 (NS-3)},
+ author={Carneiro, Gustavo and Fortuna, Pedro and Ricardo, Manuel},
+ booktitle={Proceedings of the Fourth International ICST Conference on Performance Evaluation Methodologies and Tools},
+ pages={1},
+ year={2009},
+ organization={ICST (Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering)}
+}
+
+@misc{ref195,
+ title = {The Network Simulator - ns-3. [online],http://www.nsnam.org/.},
+}
+
+@inproceedings{ref197,
+ title={The OMNeT++ discrete event simulation system},
+ author={Varga, Andr{\'a}s and others},
+ booktitle={Proceedings of the European simulation multiconference (ESM’2001)},
+ volume={9},
+ number={S 185},
+ pages={65},
+ year={2001},
+ organization={sn}
+}
+
+@inproceedings{ref198,
+ title={Parallel simulation made easy with omnet++},
+ author={Sekercioglu, Y and Varga, Andr{\'a}s and Egan, Gregory},
+ booktitle={The European Simulation Symposium (ESS 2003)(Alexander Verbraeck 26 October 2003 to 29 October 2003)},
+ pages={493--499},
+ year={2003},
+ organization={SCS European Publishing House}
+}
+
+
+@inproceedings{ref200,
+ title={Network simulations with OPNET},
+ author={Chang, Xinjie},
+ booktitle={Proceedings of the 31st conference on Winter simulation: Simulation---a bridge to the future-Volume 1},
+ pages={307--314},
+ year={1999},
+ organization={ACM}
+}
+
+@inproceedings{ref201,
+ title={Survey of wireless sensor networks simulation tools for demanding applications},
+ author={Korkalainen, Marko and Sallinen, Mikko and Karkkainen, Niilo and Tukeva, Pirkka},
+ booktitle={Networking and Services, 2009. ICNS'09. Fifth International Conference on},
+ pages={102--106},
+ year={2009},
+ organization={IEEE}
+}
+
+@article{ref202,
+ title={Glomosim: A scalable network simulation environment},
+ author={Bajaj, Lokesh and Takai, Mineo and Ahuja, Rajat and Tang, Ken and Bagrodia, Rajive and Gerla, Mario},
+ journal={UCLA Computer Science Department Technical Report},
+ volume={990027},
+ pages={213},
+ year={1999},
+ publisher={Citeseer}
+}
+
+
+@inproceedings{ref203,
+ title={An overview of the OMNeT++ simulation environment},
+ author={Varga, Andr{\'a}s and Hornig, Rudolf},
+ booktitle={Proceedings of the 1st international conference on Simulation tools and techniques for communications, networks and systems \& workshops},
+ pages={60},
+ year={2008},
+ organization={ICST (Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering)}
+}
+
+@inproceedings{ref204,
+ title={GloMoSim: a library for parallel simulation of large-scale wireless networks},
+ author={Zeng, Xiang and Bagrodia, Rajive and Gerla, Mario},
+ booktitle={Parallel and Distributed Simulation, 1998. PADS 98. Proceedings. Twelfth Workshop on},
+ pages={154--161},
+ year={1998},
+ organization={IEEE}
+}
+
+@inproceedings{ref205,
+ title={A survey of simulation in sensor networks},
+ author={Singh, Chandresh Pratap and Vyas, OP and Tiwari, Manoj Kumar},
+ booktitle={Computational Intelligence for Modelling Control \& Automation, 2008 International Conference on},
+ pages={867--872},
+ year={2008},
+ organization={IEEE}
+}
+
+@incollection{ref206,
+ title={SENSE: a wireless sensor network simulator},
+ author={Chen, Gilbert and Branch, Joel and Pflug, Michael and Zhu, Lijuan and Szymanski, Boleslaw},
+ booktitle={Advances in pervasive computing and networking},
+ pages={249--267},
+ year={2005},
+ publisher={Springer}
+}
+
+@inproceedings{ref207,
+ title={TOSSIM: Accurate and scalable simulation of entire TinyOS applications},
+ author={Levis, Philip and Lee, Nelson and Welsh, Matt and Culler, David},
+ booktitle={Proceedings of the 1st international conference on Embedded networked sensor systems},
+ pages={126--137},
+ year={2003},
+ organization={ACM}
+}
+
+@article{ref208,
+ title={Tossim: A simulator for tinyos networks},
+ author={Levis, Philip and Lee, Nelson},
+ journal={UC Berkeley, September},
+ volume={24},
+ year={2003}
+}
+
+@inproceedings{ref209,
+ title={Simulation of large-scale sensor networks using GTSNetS},
+ author={Ould-Ahmed-Vall, E-M and Riley, George F and Heck, Bonnie S and Reddy, Dheeraj},
+ booktitle={Modeling, Analysis, and Simulation of Computer and Telecommunication Systems, 2005. 13th IEEE International Symposium on},
+ pages={211--218},
+ year={2005},
+ organization={IEEE}
+}
+
+@article{ref210,
+ title={Large-scale sensor networks simulation with gtsnets},
+ author={Riley, George F and Heck, Bonnie S and others},
+ journal={Simulation},
+ volume={83},
+ number={3},
+ pages={273--290},
+ year={2007},
+ publisher={Sage Publications}
+}
+
+
+@misc{ref211,
+ title = {Wikipedia. Linear programming - Wikipedia, the free encyclopedia. [online],http://en.wikipedia.org/wiki/Linear$\_$programming/.},
+}
+
+
+@article{ref212,
+ title={Analysis of Commercial and Free and Open Source Solvers for the Cell Suppression Problem},
+ author={Meindl, Bernhard and Templ, Matthias},
+ journal={Transactions on Data Privacy},
+ volume={6},
+ number={2},
+ pages={147--159},
+ year={2013},
+ publisher={IIIA-CSIC}
+}
+
+@techreport{ref213,
+ title={Comparison of open-source linear programming solvers.},
+ author={Gearhart, Jared Lee and Adair, Kristin Lynn and Detry, Richard J and Durfee, Justin D and Jones, Katherine A and Martin, Nathaniel},
+ year={2013},
+ institution={Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)}
+}
+
+@misc{ref214,
+ title = {A. Makhorin, GLPK (GNU Linear Programming Kit). [online],http://www.gnu.org/software/glpk/glpk.html.},
+}
+
+@misc{ref215,
+ title = {The lp$\textunderscore$solve solver. [online],http://lpsolve.sourceforge.net/5.5/.},
+}
+
+@misc{ref216,
+ title = {The COIN-OR LP. [online],http://en.wikipedia.org/wiki/COIN-OR.},
+}
+
+@misc{ref217,
+ title = {The COIN-OR, Computational Infrastructure for Operations Research. [online],http://www.coin-or.org.}, }
+
+@misc{ref218,
+ title = {The IBM ILOG CPLEX Optimization Studio. [online],http://www-03.ibm.com/software/products/en/ibmilogcpleoptistud/.}, }
+
+
+@misc{ref219,
+ title = {The Gurobi Optimization Inc. Gurobi Optimizer. [online],http://www.gurobi.com/.}, }
+
+@misc{ref220,
+ title = {The Gurobi Optimizer. [online],http://en.wikipedia.org/wiki/Gurobi.}, }
+
+
+ @inproceedings{ref221,
+ title={Improved branch and bound algorithm with a comparison between different LP solvers},
+ author={Barreto, Lucio S and Haffner, S{\'e}rgio and Pereira, Lu{\'\i}s A and Bauer, Michael},
+ booktitle={Industry Applications (INDUSCON), 2010 9th IEEE/IAS International Conference on},
+ pages={1--6},
+ year={2010},
+ organization={IEEE}
+}
+
+@book{ref222,
+ author = {S. Misra and I. Woungang and S. C. Misra},
+ title = {Guide to Wireless Sensor Networks},
+ publisher = {Springer-Verlag London Limited},
+ year = {2009},
+}
+
+
+@article{ref223,
+ title={Wireless sensor networks: applications and challenges of ubiquitous sensing},
+ author={Puccinelli, Daniele and Haenggi, Martin},
+ journal={Circuits and Systems Magazine, IEEE},
+ volume={5},
+ number={3},
+ pages={19--31},
+ year={2005},
+ publisher={IEEE}
+}
+
+@inproceedings{ref224,
+ title={Probabilistic coverage in wireless sensor networks},
+ author={Ahmed, Nadeem and Kanhere, Salil S and Jha, Sanjay},
+ booktitle={Local Computer Networks, 2005. 30th Anniversary. The IEEE Conference on},
+ pages={8--pp},
+ year={2005},
+ organization={IEEE}
+}
+
+@inproceedings{ref225,
+ title={Incremental Model for Complete Area Coverage in Wireless Sensor Networks},
+ author={Sethi, Hemendra Kumar and Dash, Sasmita and Lenka, Manas Ranjan and Swain, Amulya Ratna},
+ booktitle={Computational Intelligence and Networks (CINE), 2015 International Conference on},
+ pages={92--97},
+ year={2015},
+ organization={IEEE}
+}
+
+@article{ref226,
+ title={Extending the Network Lifetime of Wireless Sensor Networks Using Residual Energy Extraction—Hybrid Scheduling Algorithm},
+ author={CHITRA, M},
+ journal={Int'l J. of Communications, Network and System Sciences},
+ volume={2010},
+ year={2010},
+ publisher={Scientific Research Publishing}
+}
+
+@article{ref227,
+ author = {Mihaela Cardei and
+ David MacCallum and
+ Maggie Xiaoyan Cheng and
+ Manki Min and
+ Xiaohua Jia and
+ Deying Li and
+ Ding-Zhu Du},
+ title = {Wireless Sensor Networks with Energy Efficient Organization},
+ journal = {Journal of Interconnection Networks},
+ volume = {3},
+ number = {3-4},
+ year = {2002},
+ pages = {213-229},
+}
+
+@inproceedings{ref228,
+ author = {D. Zorbas and D. Glynos and P. Kotzanikolaou and C. Douligeris},
+ title = {B\{GOP\}: an adaptive coverage algorithm for wireless sensor networks},
+ booktitle = {Proceedings of the 13th European Wireless Conference},
+ series = {EW'07},
+ year = {2007},
+ location = {Paris, France},
+
+}
+
+@inproceedings{ref229,
+ title={A near optimal algorithm for lifetime optimization in wireless sensor networks},
+ author={Deschinkel, Karine and Hakem, Mourad},
+ booktitle={SENSORNETS 2013, 2nd Int. Conf. on Sensor Networks},
+ pages={197--202},
+ year={2013}
+}
+
+@article{ref230,
+ title={Maximizing system lifetime in wireless sensor networks},
+ author={Alfieri, Arianna and Bianco, Andrea and Brandimarte, Paolo and Chiasserini, Carla-Fabiana},
+ journal={European Journal of Operational Research},
+ volume={181},
+ number={1},
+ pages={390--402},
+ year={2007},
+ publisher={Elsevier}
+}
+
+@inproceedings{ref231,
+ title={Maximize lifetime of heterogeneous wireless sensor networks with joint coverage and connectivity requirement},
+ author={Gu, Yu and Ji, Yusheng and Zhao, Baohua},
+ booktitle={Scalable Computing and Communications; Eighth International Conference on Embedded Computing, 2009. SCALCOM-EMBEDDEDCOM'09. International Conference on},
+ pages={226--231},
+ year={2009},
+ organization={IEEE}
+}
+
+@incollection{ref232,
+ title={A review on localization in wireless sensor networks},
+ author={Kuriakose, Jeril and Joshi, Sandeep and Raju, R Vikram and Kilaru, Aravind},
+ booktitle={Advances in signal processing and intelligent recognition systems},
+ pages={599--610},
+ year={2014},
+ publisher={Springer}
+}
+
+@article{ref233,
+ title={Localization techniques in wireless sensor networks},
+ author={Alrajeh, Nabil Ali and Bashir, Maryam and Shams, Bilal},
+ journal={International Journal of Distributed Sensor Networks},
+ volume={2013},
+ year={2013},
+ publisher={Hindawi Publishing Corporation}
+}
+
+@inproceedings{ref234,
+ title={UREA: Uncovered region exploration algorithm for reorganization of mobile sensor nodes to maximize coverage},
+ author={Nene, Manisha J and Deodhar, Rajendra S and Patnaik, Lalit M},
+ booktitle={Distributed Computing in Sensor Systems Workshops (DCOSSW), 2010 6th IEEE International Conference on},
+ pages={1--6},
+ year={2010},
+ organization={IEEE}
+}
+
+@inproceedings{ref235,
+ title={Mobility improves coverage of sensor networks},
+ author={Liu, Benyuan and Brass, Peter and Dousse, Olivier and Nain, Philippe and Towsley, Don},
+ booktitle={Proceedings of the 6th ACM international symposium on Mobile ad hoc networking and computing},
+ pages={300--308},
+ year={2005},
+ organization={ACM}
+}
+
+@article{ref236,
+ title={Localization and coverage for high density sensor networks},
+ author={Bahi, Jacques M and Makhoul, Abdallah and Mostefaoui, Ahmed},
+ journal={Computer Communications},
+ volume={31},
+ number={4},
+ pages={770--781},
+ year={2008},
+ publisher={Elsevier}
+}
+
+@article{ref237,
+ title={Hilbert mobile beacon for localisation and coverage in sensor networks},
+ author={Bahi, Jacques M and Makhoul, Abdallah and Mostefaoui, Ahmed},
+ journal={International Journal of Systems Science},
+ volume={39},
+ number={11},
+ pages={1081--1094},
+ year={2008},
+ publisher={Taylor \& Francis}
+}
+
+@article{ref238,
+ title={Heuristic optimization methods in econometrics},
+ author={Gilli, Manfred and Winker, Peter},
+ journal={Handbook of computational econometrics},
+ pages={81--119},
+ year={2009},
+ publisher={Wiley}
+}