@inproceedings{UML-1997-SchurrW,
	author        = "Andy Schürr and Andreas J. Winter",
	booktitle     = "{The Unified Modeling Language — Technical Aspects and Applications}",
	isbn          = "3-7908-1105-X",
	pages         = "144--159",
	publisher     = "{Physica-Verlag}",
	title         = "{Formal Definition of UML’s Package Concept}",
	year          = 1997,
}