Vlado Handziski Andreas Köpke Holger Karl Christian Frank Witold Drytkiewicz Improving the Energy Efficiency of Directed Diffusion Using Passive Clustering. 172-187 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2920&spage=172 2004 conf/ewsn/2004 EWSN db/conf/ewsn/ewsn2004.html#HandziskiKKFD04