Increasing the Quality and Quantity of Source Language Data for Unsupervised Cross-Lingual POS Tagging Long Duong author Paul Cook author Steven Bird author Pavel Pecina author 2013-10 text Proceedings of the Sixth International Joint Conference on Natural Language Processing Ruslan Mitkov editor Jong C Park editor Asian Federation of Natural Language Processing Nagoya, Japan conference publication duong-etal-2013-increasing https://aclanthology.org/I13-1177/ 2013-10 1243 1249