PAL: A Chatterbot System for Answering Domain-specific Questions Yuanchao Liu author Ming Liu author Xiaolong Wang author Limin Wang author Jingjing Li author 2013-08 text Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics: System Demonstrations Miriam Butt editor Sarmad Hussain editor Association for Computational Linguistics Sofia, Bulgaria conference publication liu-etal-2013-pal https://aclanthology.org/P13-4012/ 2013-08 67 72