@inproceedings{HCI-SHI-1993-SaitoN,
	author        = "H. Saito and Morio Nagata",
	booktitle     = "{Proceedings of the Fifth International Conference on Human-Computer Interaction. Volume 2: Software and Hardware Interfaces}",
	isbn          = "0-444-89540-X",
	pages         = "267--272",
	publisher     = "{Elsevier}",
	title         = "{An Algebraic System that Symbolic Expressions Can Interact with Graphical Representations for Understanding Mathematics}",
	year          = 1993,
}