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Qingsong Ma, Ondřej Bojar, Yvette Graham (2018): Results of the WMT18 Metrics Shared Task: Both characters and embeddings achieve good performance. In: Proceedings of the Third Conference on Machine Translation, Volume 2: Shared Tasks, pp. 682-701, Association for Computational Linguistics, Stroudsburg, PA, USA, ISBN 978-1-948087-81-0 (pdf, bibtex)