CIRCSIM-Tutor: An Intelligent Tutoring System Using Natural Language Dialogue Martha W Evens author Ru-Charn Chang author Yoon Hee Lee author Leem Seop Shim author Chong Woo Woo author Yuemei Zbang author 1997-03 text Fifth Conference on Applied Natural Language Processing: Descriptions of System Demonstrations and Videos Association for Computational Linguistics Washington, DC, USA conference publication evens-etal-1997-circsim 10.3115/974281.974289 https://aclanthology.org/A97-2007/ 1997-03 13 14