@inproceedings{POPL-2001-Calcagno,
	author        = "Cristiano Calcagno",
	booktitle     = "{Conference Record of the 28th Symposium on Principles of Programming Languages}",
	doi           = "10.1145/360204.360217",
	editor        = "Chris Hankin and Dave Schmidt",
	isbn          = "1-58113-336-7",
	pages         = "155--165",
	publisher     = "{ACM}",
	title         = "{Stratified operational semantics for safety and correctness of the region calculus}",
	year          = 2001,
}