G-TUNA: a corpus of referring expressions in German, including duration information David Howcroft author Jorrig Vogels author Vera Demberg author 2017-09 text Proceedings of the 10th International Conference on Natural Language Generation Jose M Alonso editor Alberto Bugarín editor Ehud Reiter editor Association for Computational Linguistics Santiago de Compostela, Spain conference publication howcroft-etal-2017-g 10.18653/v1/W17-3522 https://aclanthology.org/W17-3522/ 2017-09 149 153