year={2014}
}
+@article{idrees2015distributed,
+ title={Distributed lifetime coverage optimization protocol in wireless sensor networks},
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+ journal={The Journal of Supercomputing},
+ volume={71},
+ number={12},
+ pages={4578--4593},
+ year={2015},
+ publisher={Springer US}
+}
+
+
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year={2001},
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-}
\ No newline at end of file
+}
+
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+ pages={296--301},
+ year={2014}
+}
+
+@article{cheng2014energy,
+ title={Energy-Efficient Node Selection Algorithms with Correlation Optimization in Wireless Sensor Networks},
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+ journal={International Journal of Distributed Sensor Networks},
+ volume={2014},
+ year={2014},
+ publisher={Hindawi Publishing Corporation}
+}
+
+@article{castano2013column,
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+ 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},
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+ 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.},
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+ journal={Sensors \& Transducers Journal},
+ volume={14-2},
+ pages={242--253},
+ year={2012}
+}
+
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+publisher={Springer-Verlag},
+author={Gentili, Monica and Raiconi, Andrea},
+pages={157-172},
+}
+
+
