+\bibcite{berman04}{Berman and Calinescu, 2004}
+\bibcite{cardei2005improving}{Cardei and Du, 2005}
+\bibcite{cardei2005energy}{Cardei et\nobreakspace {}al., 2005}
+\bibcite{castano2013column}{Casta{\~n}o et\nobreakspace {}al., 2013}
+\bibcite{conti2014mobile}{Conti and Giordano, 2014}
+\bibcite{Deng2012}{Deng et\nobreakspace {}al., 2012}
+\bibcite{deschinkel2012column}{Deschinkel, 2012}
+\bibcite{idrees2014coverage}{Idrees et\nobreakspace {}al., 2014}
+\bibcite{jaggi2006}{Jaggi and Abouzeid, 2006}
+\bibcite{kim2013maximum}{Kim and Cobb, 2013}
+\bibcite{Kumar:2005}{Kumar et\nobreakspace {}al., 2005}
+\bibcite{li2013survey}{Li and Vasilakos, 2013}
+\newlabel{sec:Conclusion and Future Works}{{6}{8}}
+\bibcite{ling2009energy}{Ling and Znati, 2009}
+\bibcite{pujari2011high}{Manju and Pujari, 2011}
+\bibcite{Misra}{Misra et\nobreakspace {}al., 2011}
+\bibcite{Nayak04}{Nayak and Stojmenovic, 2010}
+\bibcite{pc10}{Padmavathy and Chitra, 2010}
+\bibcite{pedraza2006}{Pedraza et\nobreakspace {}al., 2006}
+\bibcite{qu2013distributed}{Qu and Georgakopoulos, 2013}
+\bibcite{raghunathan2002energy}{Raghunathan et\nobreakspace {}al., 2002}
+\bibcite{rossi2012exact}{Rossi et\nobreakspace {}al., 2012}
+\bibcite{varga}{Varga, 2003}
+\bibcite{ChinhVu}{Vu et\nobreakspace {}al., 2006}
+\bibcite{chin2007}{Vu, 2009}
+\bibcite{5714480}{Xing et\nobreakspace {}al., 2010}
+\bibcite{xu2001geography}{Xu et\nobreakspace {}al., 2001}
+\bibcite{yang2014novel}{Yang and Chin, 2014a}
+\bibcite{yangnovel}{Yang and Chin, 2014b}
+\bibcite{Yang2014}{Yang and Liu, 2014}
+\bibcite{Zhang05}{Zhang and Hou, 2005}
+\bibcite{zorbas2010solving}{Zorbas et\nobreakspace {}al., 2010}