G. Botterweck, Groher, I., Polzer, A., Schwanninger, C., Thiel, S., and Völter, M., “1st International Workshop on Model-driven Approaches in Software Product Line Engineering: (MAPLE 2009)”, in Software Product Lines, 13th International Conference, SPLC 2009, San Francisco, California, USA, August 24-28, 2009, Proceedings, 2009, pp. 297-298, doi: 10.1145/1753235.1753277.