Managing Complex Event Processes with Business Process Modeling Notation. - Steffen Kunz; Tobias Fickinger; Johannes Prescher; Klaus Spengler (BPMN, 2010)

"Deal of the Day" Platforms: What Drives Consumer Loyalty? - Hanna Krasnova; Natasha F. Veltri; Klaus Spengler; Oliver Günther 001 (Bus. Inf. Syst. Eng., 2013)

"Deal of the Day"-Plattformen: Was treibt die Kundenloyalität? - Hanna Krasnova; Natasha F. Veltri; Klaus Spengler; Oliver Günther 001 (Wirtschaftsinf., 2013)