Conversation Modeling on Reddit Using a Graph-Structured LSTM Victoria Zayats author Mari Ostendorf author 2018 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal zayats-ostendorf-2018-conversation 10.1162/tacl_a_00009 https://aclanthology.org/Q18-1009/ 2018 6 121 132