1. Sofia Ananieva, Matthias Kowal, Thomas Thüm, and Ina Schaefer. 2016. Implicit constraints in partial feature models. In Proc. of the 7th Int. FOSD Workshop, FOSD@SPLASH 2016, Amsterdam, Netherlands, October 30, 2016. 18--27.
2. Sven Apel, Don Batory, Christian Kaestner, and Gunter Saake. 2013. Feature-Oriented Software Development: Concepts and Implementation. Springer.
3. Rabih Bashroush, Muhammad Garba, Rick Rabiser, Iris Groher, and Goetz Botterweck. 2017. CASE Tool Support for Variability Management in Software Product Lines. Comput. Surveys 50, 1 (2017), 14:1--14:45.
4. Luca Berardinelli, Alexandra Mazak, Oliver Alt, Manuel Wimmer, and Gerti Kappel. 2017. Model-driven systems engineering: Principles and application in the CPPS domain. In Multi-Disciplinary Engineering for Cyber-Physical Production Systems. Springer, 261--299.
5. Thorsten Berger, Ralf Rublack, Divya Nair, Joanne M Atlee, Martin Becker, Krzysztof Czarnecki, and Andrzej Wąsowski. 2013. A survey of variability modeling in industrial practice. In Proc. of the 7th Int. Workshop on Variability Modelling of Software-intensive Systems. ACM, 7--14.