Fujio Nishida, Yoneharu Fujita, Hiroji Kusaka. Problem Solving of Elementary Algebra by Hierarchical Abstraction. In Bruce G. Buchanan, editor, Proceedings of the Sixth International Joint Conference on Artificial Intelligence, IJCAI 79, Tokyo, Japan, August 20-23, 1979, 2 Volumes. pages 659-661, William Kaufmann, 1979.
Abstract is missing.