Bin Xiao Hekang Chen Shuigeng Zhou Distributed Localization Using a Moving Beacon in Wireless Sensor Networks. 587-600 2008 19 IEEE Trans. Parallel Distrib. Syst. 5 http://doi.ieeecomputersociety.org/10.1109/TPDS.2007.70773 db/journals/tpds/tpds19.html#XiaoCZ08