Talking about what is not there: Generating indefinite referring expressions in Minecraft Arne Köhn author Alexander Koller author 2019-oct–nov text Proceedings of the 12th International Conference on Natural Language Generation Kees van Deemter editor Chenghua Lin editor Hiroya Takamura editor Association for Computational Linguistics Tokyo, Japan conference publication kohn-koller-2019-talking 10.18653/v1/W19-8601 https://aclanthology.org/W19-8601/ 2019-oct–nov 1 10