@inproceedings{SPLC-2011-NolanACP,
	author        = "Andy J. Nolan and Silvia Abrahão and Paul C. Clements and Andy Pickard",
	booktitle     = "{Proceedings of the 15th International Software Product Line Conference}",
	doi           = "10.1109/SPLC.2011.13",
	isbn          = "978-1-4577-1029-2",
	pages         = "223--231",
	publisher     = "{IEEE}",
	title         = "{Requirements Uncertainty in a Software Product Line}",
	year          = 2011,
}