Iyad A. Kanj Ljubomir Perkovic Ge Xia Local Construction of Near-Optimal Power Spanners for Wireless Ad Hoc Networks. 460-474 2009 8 IEEE Trans. Mob. Comput. 4 http://dx.doi.org/10.1109/TMC.2008.132 db/journals/tmc/tmc8.html#KanjPX09