Yang Song 0008 Anca Sailer Hidayatullah Shaikh 345-357 2012 5 IEEE Trans. Serv. Comput. 3 https://doi.org/10.1109/TSC.2011.3 http://doi.ieeecomputersociety.org/10.1109/TSC.2011.3 db/journals/tsc/tsc5.html#SongSS12