Business Models of Store-Oriented Software Ecosystems: A Variability Modeling Approach
S. Gottschalk, F. Rittmeier, G. Engels, in: B. Shishkov (Ed.), Business Modeling and Software Design, Springer International Publishing, 2019, pp. 153–169.

Verteiltes Warenwirtschaftssystem [Distributed Warehouse System]
T. Göllner, J.-H. Schwarz, S. Gottschalk, S. Sauer, (2019).

Intertwined Development of Business Model and Product Functions for Mobile Applications: A Twin Peak Feature Modeling Approach
S. Gottschalk, F. Rittmeier, G. Engels, in: S. Hyrynsalmi, M. Suoranta, A. Nguyen-Duc, P. Tyrväinen, P. Abrahamsson (Eds.), Software Business, Springer International Publishing, Cham, 2019, pp. 192–207.