John A. Self. Hanging by Two Threads: The Evolution of Intelligent Tutoring Systems Research. In Barry P. Goettl, Henry M. Halff, Carol L. Redfield, Valerie J. Shute, editors, Intelligent Tutoring Systems, 4th International Conference, ITS 98, San Antonio, Texas, USA, August 16-19, 1998, Proceedings. Volume 1452 of Lecture Notes in Computer Science, pages 3, Springer, 1998. [doi]
Abstract is missing.