Sven Apel: The role of features and aspects in software development: similarities, differences, and synergetic potential. VDM Verlag Dr. Müller, Saarbrücken 2007, ISBN 978-3-8364-3344-0 (dnb.de [abgerufen am 4. November 2022]).
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Christian Kästner, Sven Apel, Martin Kuhlemann: Granularity in software product lines. In: Proceedings of the 13th international conference on Software engineering – ICSE '08. ACM Press, Leipzig, Germany 2008, ISBN 978-1-60558-079-1, S.311, doi:10.1145/1368088.1368131.
Janet Feigenspan, Christian Kästner, Jörg Liebig, Sven Apel, Stefan Hanenberg: Measuring programming experience. In: 2012 20th IEEE International Conference on Program Comprehension (ICPC). Juni 2012, S.73–82, doi:10.1109/ICPC.2012.6240511.
Sven Apel, Don Batory, Christian Kästner, Gunter Saake: Feature-Oriented Software Product Lines. Springer Berlin Heidelberg, Berlin, Heidelberg 2013, ISBN 978-3-642-37520-0, doi:10.1007/978-3-642-37521-7.
Janet Siegmund, Christian Kästner, Sven Apel, Chris Parnin, Anja Bethmann: Understanding understanding source code with functional magnetic resonance imaging. In: Proceedings of the 36th International Conference on Software Engineering. ACM, Hyderabad India 2014, ISBN 978-1-4503-2756-5, S.378–389, doi:10.1145/2568225.2568252.