Bernardo Magnini, Roberto Zanoli, Ido Dagan, Kathrin Eichler, Guenter Neumann, Tae-Gil Noh, Sebastian Pado, Asher Stern, Omer Levy. Proceedings of 52nd Annual Meeting of the Association for Computational Linguistics: System Demonstrations. 2014.
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Magnini et al. (2014) studied this question.