PHRAN - A Knowledge-Based Natural Language Understander Robert Wilensky author Yigal Arens author 1980-06 text 18th Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Philadelphia, Pennsylvania, USA conference publication wilensky-arens-1980-phran 10.3115/981436.981471 https://aclanthology.org/P80-1030/ 1980-06 117 121