@inproceedings{IWPTS-1993-Drira,
	author        = "Khalil Drira",
	booktitle     = "{Proceedings of the Sixth International Workshop on Protocol Test Systems}",
	isbn          = "0-444-81697-6",
	pages         = "297--312",
	publisher     = "{North-Holland}",
	series        = "{IFIP Transactions}",
	title         = "{The Refusal Graph: a Tradeoff between Verification and Test}",
	volume        = "C-19",
	year          = 1993,
}