Wei Cheng Nan Zhang 0004 Min Song Dechang Chen Xicheng Lu Zexin Lu Time-Bounded Essential Localization for Wireless Sensor Networks. 3-12 2010 NAS http://doi.ieeecomputersociety.org/10.1109/NAS.2010.55 conf/nas/2010 db/conf/nas/nas2010.html#ChengZSCLL10