@inproceedings{ICSE-1990-OswaldEM,
	acmid         = "100319",
	author        = "Heinz Oswald and R. Esser and R. Mattmann",
	booktitle     = "{Proceedings of the 12th International Conference on Software Engineering}",
	editor        = "François-Régis Valette and Peter A. Freeman and Marie-Claude Gaudel",
	isbn          = "0-8186-2026-9",
	pages         = "164--172",
	publisher     = "{IEEE Computer Society}",
	title         = "{An Environment for Specifying and Executing Hierarchical Petri Nets}",
	year          = 1990,
}