Beibei Wang Zhu Han K. J. Ray Liu Distributed Relay Selection and Power Control for Multiuser Cooperative Communication Networks Using Stackelberg Game. 975-990 2009 8 IEEE Trans. Mob. Comput. 7 http://doi.ieeecomputersociety.org/10.1109/TMC.2008.153 db/journals/tmc/tmc8.html#WangHL09