Jung-Chieh Chen Yeong-Cheng Wang Jiunn-Tsair Chen A novel broadcast scheduling strategy using factor graphs and the sum-product algorithm. 1241-1249 2006 5 IEEE Trans. Wirel. Commun. 6 https://doi.org/10.1109/TWC.2006.1638642 db/journals/twc/twc5.html#ChenWC06