@inproceedings{SPLC-2006-BragancaM,
	author        = "Alexandre Bragança and Ricardo Jorge Machado",
	booktitle     = "{Proceedings of the 10th International Software Product Line Conference}",
	isbn          = "0-7695-2599-7",
	pages         = "123--130",
	publisher     = "{IEEE Computer Society}",
	title         = "{Extending UML 2.0 Metamodel for Complementary Usages of the «extend» Relationship within Use Case Variability Specification}",
	year          = 2006,
}