Ilan Sutskover Shlomo Shamai Jacob Ziv Constrained Information Combining: Theory and Applications for LDPC Coded Systems. 1617-1643 2007 53 IEEE Transactions on Information Theory 5 http://dx.doi.org/10.1109/TIT.2007.894645 db/journals/tit/tit53.html#SutskoverSZ07