Pawan Jadia Anish Mathuria Efficient Secure Aggregation in Sensor Networks. 40-49 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3296&spage=40 2004 conf/hipc/2004 HiPC db/conf/hipc/hipc2004.html#JadiaM04