Logical Forms in the Core Language Engine Hiyan Alshawi author Jan van Eijck author 1989-06 text 27th Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Vancouver, British Columbia, Canada conference publication alshawi-van-eijck-1989-logical 10.3115/981623.981627 https://aclanthology.org/P89-1004/ 1989-06 25 32