@inproceedings{AS-1989-WirsingB,
	author        = "Martin Wirsing and Manfred Broy",
	booktitle     = "{Proceedings of the Third International Joint Conference on Theory and Practice of Software Development, Volume 1: Advanced Seminar on Foundations of Innovative Software Development}",
	doi           = "10.1007/3-540-50939-9_124",
	isbn          = "3-540-50939-9",
	pages         = "42--73",
	publisher     = "{Springer}",
	title         = "{A Modular Framework for Specification and Implementation}",
	year          = 1989,
}