Mohamed A. Sharaf Jonathan Beaver Alexandros Labrinidis Panos K. Chrysanthis Balancing energy efficiency and quality of aggregate data in sensor networks. 384-403 2004 13 VLDB J. 4 http://dx.doi.org/10.1007/s00778-004-0138-0 db/journals/vldb/vldb13.html#SharafBLC04