+}
+
+@article{yang2014maximum,
+ title={A Maximum Lifetime Coverage Algorithm Based on Linear Programming},
+ author={Yang, Mengmeng and Liu, Jie},
+ journal={Journal of Information Hiding and Multimedia Signal Processing },
+ volume={5},
+ number={2},
+ pages={296--301},
+ year={2014}
+}
+
+@article{cheng2014energy,
+ title={Energy-Efficient Node Selection Algorithms with Correlation Optimization in Wireless Sensor Networks},
+ author={Cheng, Hongju and Su, Zhihuang and Zhang, Daqiang and Lloret, Jaime and Yu, Zhiyong},
+ journal={International Journal of Distributed Sensor Networks},
+ volume={2014},
+ year={2014},
+ publisher={Hindawi Publishing Corporation}
+}
+
+@article{castano2013column,
+ title={A column generation approach to extend lifetime in wireless sensor networks with coverage and connectivity constraints},
+ author={Casta{\~n}o, Fabian and Rossi, Andr{\'e} and Sevaux, Marc and Velasco, Nubia},
+ journal={Computers \& Operations Research},
+ year={2013},
+ publisher={Elsevier}
+}
+
+@article{rossi2012exact,
+ title={An exact approach for maximizing the lifetime of sensor networks with adjustable sensing ranges},
+ author={Rossi, Andr{\'e} and Singh, Alok and Sevaux, Marc},
+ journal={Computers \& Operations Research},
+ volume={39},
+ number={12},
+ pages={3166--3176},
+ year={2012},
+ publisher={Elsevier}
+}
+
+@article{deschinkel2012column,
+ title={A Column Generation based Heuristic to Extend Lifetime in Wireless Sensor Network.},
+ author={Deschinkel, Karine},
+ journal={Sensors \& Transducers Journal},
+ volume={14-2},
+ pages={242--253},
+ year={2012}
+}
+
+@article{gentili2013,
+year={2013},
+journal={Optimization Letters},
+volume={7},
+number={1},
+title={α-Coverage to extend network lifetime on wireless sensor networks},
+publisher={Springer-Verlag},
+author={Gentili, Monica and Raiconi, Andrea},
+pages={157-172},
+}
+
+
