Deepak Dhungana Thomas Neumayer Paul Grünbacher Rick Rabiser Supporting the Evolution of Product Line Architectures with Variability Model Fragments. 327-330 2008 WICSA http://doi.ieeecomputersociety.org/10.1109/WICSA.2008.23 conf/wicsa/2008 db/conf/wicsa/wicsa2008.html#DhunganaNGR08