@article{RWLW-1996-WirsingK,
	author        = "Martin Wirsing and Alexander Knapp",
	doi           = "10.1016/S1571-0661(04)00046-5",
	journal       = "{Electronic Notes in Theoretical Computer Science}",
	pages         = "322--360",
	title         = "{A formal approach to object-oriented software engineering}",
	volume        = 4,
	year          = 1996,
}