C. Meier, IT Project Portfolio Selection in the Presence of Project Interactions. Universität Paderborn, 2015.

T. Mutter, On the Activating Power of Gamification –  Empirical Evidence from an Online Community. Universität Paderborn, 2015.

P. Herrmann, On Consumer Purchasing Behavior in Electronic Markets. Universität Paderborn, 2014.