CMU System Combination in WMT 2011 Kenneth Heafield author Alon Lavie author 2011-07 text Proceedings of the Sixth Workshop on Statistical Machine Translation Chris Callison-Burch editor Philipp Koehn editor Christof Monz editor Omar F Zaidan editor Association for Computational Linguistics Edinburgh, Scotland conference publication heafield-lavie-2011-cmu https://aclanthology.org/W11-2117/ 2011-07 145 151