Hüseyin Akcan Vassil Kriakov Hervé Brönnimann Alex Delis GPS-Free node localization in mobile wireless sensor networks. 35-42 2006 conf/mobide/2006 MobiDE http://doi.acm.org/10.1145/1140104.1140113 db/conf/mobide/mobide2006.html#AkcanKBD06