@inproceedings{IWPTS-1991-VelthuysZ,
	author        = "Roelof Jan Velthuys and Georg Zörntlein",
	booktitle     = "{Proceedings of the Fourth International Workshop on Protocol Test Systems}",
	isbn          = "0-444-89517-5",
	pages         = "231--253",
	publisher     = "{North-Holland}",
	series        = "{IFIP Transactions}",
	title         = "{Relating Events for Conformance Testing — a Pragmatic Approach}",
	volume        = "C-3",
	year          = 1991,
}