Generation Challenges 2011 Preface Anja Belz author Albert Gatt author Alexander Koller author Kristina Striegnitz author 2011-09 text Proceedings of the 13th European Workshop on Natural Language Generation Claire Gardent editor Kristina Striegnitz editor Association for Computational Linguistics Nancy, France conference publication belz-etal-2011-generation https://aclanthology.org/W11-2829/ 2011-09 206 207