Key points are not available for this paper at this time.
Ondřej Bojar, Christian Federmann, Mark Fishel, Yvette Graham, Barry Haddow, Matthias Huck, Philipp Koehn, Christof Monz. Proceedings of the Third Conference on Machine Translation: Shared Task Papers. 2018.
Bojar et al. (Mon,) studied this question.