Ajoy Kumar Datta Preethi Linga Maria Gradinariu Philippe Raipin Parvédy Self Distributed Query Region Covering in Sensor Networks. 50-59 2005 conf/srds/2005 SRDS http://doi.ieeecomputersociety.org/10.1109/RELDIS.2005.27 db/conf/srds/srds2005.html#DattaLGP05