@inproceedings{LICS-1990-Lewis,
	author        = "Harry R. Lewis",
	booktitle     = "{Proceedings of the Fifth Annual Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.1990.113763",
	isbn          = "0-8186-2073-0",
	pages         = "380--389",
	publisher     = "{IEEE Computer Society}",
	title         = "{A Logic of Concrete Time Intervals}",
	year          = 1990,
}