@inproceedings { 291,
	title = {Towards a Unified Framework for Contextual Variability in Requirements},
	journal = {3rd International Workshop on Software Product Management (IWSPM09)},
	year = {2009},
	author = {Ali, R. and Yu, Y. and Chitchyan, R. and Nhlabatsi, A. and Giorgini, P.}
}