Emil Falck Patrik Floréen Petteri Kaski Jukka Kohonen Pekka Orponen Balanced Data Gathering in Energy-Constrained Sensor Networks. 59-70 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3121&spage=59 2004 conf/algosensors/2004 ALGOSENSORS db/conf/algosensors/algosensors2004.html#FalckFKKO04