Shilpa Dhar Krishnendu Roy Rajgopal Kannan NEC: Node Energy Based Clustering Protocol for Wireless Sensor Networks with Guaranteed Connectivity. 75-84 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3347&spage=75 2004 conf/icdcit/2004 ICDCIT db/conf/icdcit/icdcit2004.html#DharRK04