“…As far as the surveys with complete emphasis on routing are concerned, the authors in [ 35 , 36 , 46 , 47 , 52 , 53 , 61 , 62 , 66 , 88 ] have mainly classified routing protocols into both structural and operational based protocols while [ 51 , 54 , 68 , 79 ] have classified them mainly using structural based categorization. The authors in [ 46 , 52 , 53 , 54 , 61 , 62 , 68 , 79 , 88 ] have outlined design issues that should be considered while devising new protocols for WSNs. In [ 46 , 52 , 54 ], the authors have discussed various application areas of WSNs.…”