-\citation{yang2014energy,ChinhVu,vashistha2007energy,deschinkel2012column,shi2009,qu2013distributed,ling2009energy,xin2009area,cheng2014achieving,ling2009energy}
-\citation{yang2014energy}
-\citation{ChinhVu}
-\citation{qu2013distributed}
+\citation{li2013survey}
+\citation{yangnovel,ChinhVu,qu2013distributed}
+\citation{cardei2005improving,zorbas2010solving,pujari2011high}
+\citation{castano2013column,rossi2012exact,deschinkel2012column}
+\citation{diongue2013alarm}