Evaluation without references: IBM1 scores as evaluation metrics Maja Popović author David Vilar author Eleftherios Avramidis author Aljoscha Burchardt 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 popovic-etal-2011-evaluation https://aclanthology.org/W11-2109/ 2011-07 99 103