Generation of Formal and Informal Sentences Fadi Abu Sheikha author Diana Inkpen 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 abu-sheikha-inkpen-2011-generation https://aclanthology.org/W11-2826/ 2011-09 187 193