Kohji Itoh, Makoto Itami, Masaru Fujihira, Takaaki Kawamura, Kiyoto Kawakami. Assisting Planning in Computer-Mediated Explorative Problem-Solving. In Gilles Gauthier, Claude Frasson, Kurt VanLehn, editors, Intelligent Tutoring Systems, 5th International Conference, ITS 2000, Montréal, Canada, June 19-23, 2000, Proceedings. Volume 1839 of Lecture Notes in Computer Science, pages 655, Springer, 2000. [doi]