Wim Codenie Nicolás González-Deleito Jeroen Deleu Vladimir Blagojevic Pasi Kuvaja Jouni Similä A Model for Trading off Flexibility and Variability in Software Intensive Product Development. 61-70 2009 VaMoS http://www.vamos-workshop.net/proceedings/VaMoS_2009_Proceedings.pdf conf/vamos/2009 db/conf/vamos/vamos2009.html#CodenieGDBKS09