An orthogonal access modifier model for feature-oriented programming. - Sven Apel; Jörg Liebig; Christian Kästner; Martin Kuhlemann; Thomas Leich (FOSD, 2009)

RobbyDBMS: a case study on hardware/software product line engineering. - Jörg Liebig; Sven Apel; Christian Lengauer; Thomas Leich (FOSD, 2009)

An analysis of the variability in forty preprocessor-based software product lines. - Jörg Liebig; Sven Apel; Christian Lengauer; Christian Kästner; Michael Schulze (ICSE (1), 2010)

Semistructured Merge in Revision Control Systems. - Sven Apel; Jörg Liebig; Christian Lengauer; Christian Kästner; William R. Cook (VaMoS, 2010)

Analyzing the discipline of preprocessor annotations in 30 million lines of C code. - Jörg Liebig; Christian Kästner; Sven Apel (AOSD, 2011)

Exploring Software Measures to Assess Program Comprehension. - Janet Feigenspan; Sven Apel; Jörg Liebig; Christian Kästner (ESEM, 2011)

Semistructured merge: rethinking merge in revision control systems. - Sven Apel; Jörg Liebig; Benjamin Brandl; Christian Lengauer; Christian Kästner (SIGSOFT FSE, 2011)

Comparing program comprehension of physically and virtually separated concerns. - Janet Siegmund; Christian Kästner; Jörg Liebig; Sven Apel (FOSD, 2012)

Measuring programming experience. - Janet Feigenspan; Christian Kästner; Jörg Liebig; Sven Apel; Stefan Hanenberg (ICPC, 2012)

Toward measuring program comprehension with functional magnetic resonance imaging. - Janet Siegmund; André Brechmann; Sven Apel; Christian Kästner; Jörg Liebig; Thomas Leich; Gunter Saake (SIGSOFT FSE, 2012)

Access control in feature-oriented programming. - Sven Apel; Sergiy S. Kolesnikov; Jörg Liebig; Christian Kästner; Martin Kuhlemann; Thomas Leich (Sci. Comput. Program., 2012)

Does the discipline of preprocessor annotations matter?: a controlled experiment. - Sandro Schulze; Jörg Liebig; Janet Siegmund; Sven Apel (GPCE, 2013)

Scalable analysis of variable software. - Jörg Liebig; Alexander von Rhein; Christian Kästner; Sven Apel; Jens Dörre; Christian Lengauer (ESEC/SIGSOFT FSE, 2013)

Feature-oriented language families: a case study. - Jörg Liebig; Rolf Daniel; Sven Apel (VaMoS, 2013)

Do background colors improve program comprehension in the #ifdef hell? - Janet Feigenspan; Christian Kästner; Sven Apel; Jörg Liebig; Michael Schulze; Raimund Dachselt; Maria Papendieck; Thomas Leich; Gunter Saake (Empir. Softw. Eng., 2013)

Measuring and modeling programming experience. - Janet Siegmund; Christian Kästner; Jörg Liebig; Sven Apel; Stefan Hanenberg (Empir. Softw. Eng., 2014)

Analyse und Transformation konfigurierbarer Systeme. - Jörg Liebig (Ausgezeichnete Informatikdissertationen, 2015)

Morpheus: Variability-Aware Refactoring in the Wild. - Jörg Liebig; Andreas Janker; Florian Garbe; Sven Apel; Christian Lengauer (ICSE (1), 2015)

Analysis and Transformation of Configurable Systems. - Jörg Liebig (2015)

Morpheus: variability-aware refactoring in the wild. - Jörg Liebig; Sven Apel; Andreas Janker; Florian Garbe; Sebastian Oster (Software Engineering, 2016)

Variability encoding: From compile-time to load-time variability. - Alexander von Rhein; Thomas Thüm; Ina Schaefer; Jörg Liebig; Sven Apel (J. Log. Algebraic Methods Program., 2016)

Handling Static Configurability in Refactoring Engines. - Jörg Liebig; Sven Apel; Andreas Janker; Florian Garbe; Sebastian Oster (Computer, 2017)

Variability-Aware Static Analysis at Scale: An Empirical Study. - Alexander von Rhein; Jörg Liebig; Andreas Janker; Christian Kästner; Sven Apel (ACM Trans. Softw. Eng. Methodol., 2018)