Expand and Filter: CUNI and LMU Systems for the WNGT 2020 Duolingo Shared Task Jindřich Libovický author Zdeněk Kasner author Jindřich Helcl author Ondřej Dušek author 2020-07 text Proceedings of the Fourth Workshop on Neural Generation and Translation Alexandra Birch editor Andrew Finch editor Hiroaki Hayashi editor Kenneth Heafield editor Marcin Junczys-Dowmunt editor Ioannis Konstas editor Xian Li editor Graham Neubig editor Yusuke Oda editor Association for Computational Linguistics Online conference publication libovicky-etal-2020-expand 10.18653/v1/2020.ngt-1.18 https://aclanthology.org/2020.ngt-1.18/ 2020-07 153 160