Improving unsupervised vector-space thematic fit evaluation via role-filler prototype clustering Clayton Greenberg author Asad Sayeed author Vera Demberg author 2015-may–jun text Proceedings of the 2015 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Rada Mihalcea editor Joyce Chai editor Anoop Sarkar editor Association for Computational Linguistics Denver, Colorado conference publication greenberg-etal-2015-improving 10.3115/v1/N15-1003 https://aclanthology.org/N15-1003/ 2015-may–jun 21 31