Moshe Twitto Igal Sason Shlomo Shamai Tightened Upper Bounds on the ML Decoding Error Probability of Binary Linear Block Codes. 1495-1510 2007 53 IEEE Transactions on Information Theory 4 http://dx.doi.org/10.1109/TIT.2007.892807 db/journals/tit/tit53.html#TwittoSS07