Maria Halkidi Dimitris Papadopoulos Vana Kalogeraki Dimitrios Gunopulos Resilient and energy efficient tracking in sensor networks. 87-100 2006 1 IJWMC 2 http://dx.doi.org/10.1504/IJWMC.2006.012468 db/journals/ijwmc/ijwmc1.html#HalkidiPKG06