Yangfan Zhong Fady Alajaji L. Lorne Campbell Error Exponents for Asymmetric Two-User Discrete Memoryless Source-Channel Coding Systems. 1487-1518 2009 55 IEEE Transactions on Information Theory 4 http://dx.doi.org/10.1109/TIT.2009.2013018 db/journals/tit/tit55.html#ZhongAC09a