Jonathan Hui Zhiyuan Ren Bruce H. Krogh Sentry-Based Power Management in Wireless Sensor Networks. 458-472 2003 conf/ipsn/2003 IPSN http://link.springer.de/link/service/series/0558/bibs/2634/26340458.htm db/conf/ipsn/ipsn2003.html#HuiRK03