Akshaye Dhawan Chinh T. Vu Alexander Zelikovsky Yingshu Li Sushil K. Prasad Maximum Lifetime of Sensor Networks with Adjustable Sensing Range. 285-289 2006 conf/snpd/2006 SNPD http://doi.ieeecomputersociety.org/10.1109/SNPD-SAWN.2006.46 db/conf/snpd/snpd2006.html#DhawanVZLP06