@inproceedings{KR-1991-DavisC,
	author        = "William S. Davis and James R. Carnes",
	booktitle     = "{Proceedings of the Second International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-165-1",
	pages         = "111--117",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Clustering Temporal Intervals To Generate Reference Hierarchies}",
	year          = 1991,
}