@article {berger.ea:2014:ecosystems, title = {Variability Mechanisms in Software Ecosystems}, journal = {Information and Software Technology}, volume = {56}, year = {2014}, chapter = {1520-1535}, attachments = {http://gsd.uwaterloo.ca/sites/default/files/ist14-berger-ecosystems.pdf}, author = {Thorsten Berger and Rolf-Helge Pfeiffer and Reinhard Tartler and Dienst, Steffen and Krzysztof Czarnecki and Andrzej W{\k a}sowski and She, Steven} }