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Petr Gebauer, Ondřej Bojar, Vojtěch Švandelík, Martin Popel (2021): CUNI Systems in WMT21: Revisiting Backtranslation Techniques for English-Czech NMT. In: Proceedings of the Sixth Conference on Machine Translation, pp. 123-129, Association for Computational Linguistics, Online, ISBN 978-1-954085-94-7 (url, local PDF, obd, bibtex)