Xiaodong He Mei Yang Jianfeng Gao Patrick Nguyen Robert Moore Improved Monolingual Hypothesis Alignment for Machine Translation System Combination. 2009 8 ACM Trans. Asian Lang. Inf. Process. 2 http://doi.acm.org/10.1145/1526252.1526254 db/journals/talip/talip8.html#HeYGNM09