Oscar Mendez-Bonilla Xavier Franch Carme Quer Requirements Patterns for COTS Systems. 232-234 2008 ICCBSS http://doi.ieeecomputersociety.org/10.1109/ICCBSS.2008.34 conf/iccbss/2008 db/conf/iccbss/iccbss2008.html#Mendez-BonillaFQ08