@inproceedings{SPLC-2011-AsirelliBGF,
	author        = "Patrizia Asirelli and Maurice H. ter Beek and Stefania Gnesi and Alessandro Fantechi",
	booktitle     = "{Proceedings of the 15th International Software Product Line Conference}",
	doi           = "10.1109/SPLC.2011.34",
	isbn          = "978-1-4577-1029-2",
	pages         = "130--139",
	publisher     = "{IEEE}",
	title         = "{Formal Description of Variability in Product Families}",
	year          = 2011,
}