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Liane Guillou, Christian Hardmeier, Preslav Nakov, Sara Stymne, Jörg Tiedemann, Yannick Versley, Mauro Cettolo, Bonnie Webber, Andrei Popescu-Belis. Proceedings of the First Conference on Machine Translation: Volume 2, Shared Task Papers. 2016.
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Guillou et al. (2016) studied this question.