Robert Szewczyk Joseph Polastre Alan M. Mainwaring David E. Culler Lessons from a Sensor Network Expedition. 307-322 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2920&spage=307 2004 conf/ewsn/2004 EWSN db/conf/ewsn/ewsn2004.html#SzewczykPMC04