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Markus Freitag, Stephan Peitz, Joern Wuebker, Hermann Ney, Matthias Huck, Rico Sennrich, Nadir Durrani, Maria Nadejde, Philip Williams, Philipp Koehn, Teresa Herrmann, Eunah Cho, Alex Waibel. Proceedings of the Ninth Workshop on Statistical Machine Translation. 2014.
Freitag et al. (Wed,) studied this question.