Topical Word Trigger Model for Keyphrase Extraction Zhiyuan Liu author Chen Liang author Maosong Sun author 2012-12 text Proceedings of COLING 2012 Martin Kay editor Christian Boitet editor The COLING 2012 Organizing Committee Mumbai, India conference publication liu-etal-2012-topical https://aclanthology.org/C12-1105/ 2012-12 1715 1730