@inproceedings{KR-2004-KaneiwaM,
	author        = "Ken Kaneiwa and Riichiro Mizoguchi",
	booktitle     = "{Proceedings of the Ninth International Conference on Principles of Knowledge Representation and Reasoning}",
	ee            = "http://www.aaai.org/Library/KR/2004/kr04-030.php",
	isbn          = "1-57735-199-1",
	pages         = "278--288",
	publisher     = "{AAAI Press}",
	title         = "{Ontological Knowledge Base Reasoning with Sort-Hierarchy and Rigidity}",
	year          = 2004,
}