Artificial intelligence tools in education : proceedings of the IFIP TC 3 Working Conference on Artificial Intelligence Tools in Education, Frascati, Italy, 26-28 May 1987 - Ercoli, Paolo; Lewis, R. 1940-; Lewis, R. (North-Holland ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co., 1988)