Performatives in a Rationally Based Speech Act Theory Philip R Cohen author Hector J Levesque author 1990-06 text 28th Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Pittsburgh, Pennsylvania, USA conference publication cohen-levesque-1990-performatives 10.3115/981823.981834 https://aclanthology.org/P90-1011/ 1990-06 79 88