Survey of Extended LEACH-Based Clustering Routing Protocols for Wireless   Sensor Networks
  An energy efficient routing protocol is the major concern in Wireless Sensor Networks (WSNs). In this survey paper, we present energy efficient hierarchical routing protocols, developed from conventional LEACH routing protocol. Main focus of our study is how these extended protocols work in order to increase the life time and how quality routing protocol are improved for WSNs. Furthermore, this paper also highlights some of the issues faced by LEACH and also explains how these issues are tackled by extended versions of LEACH. We compare the features and performance issues of the selected hierarchal routing protocols. 
M. Aslam, N. Javaid, A. Rahim, U. Nazir, A. Bibi, Z. A. Khan
cs.NI