What You Say and How You Say it: Joint Modeling of Topics and Discourse in Microblog Conversations Jichuan Zeng author Jing Li author Yulan He author Cuiyun Gao author Michael R Lyu author Irwin King author 2019 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal zeng-etal-2019-say 10.1162/tacl_a_00267 https://aclanthology.org/Q19-1017/ 2019 7 267 281