Meier C. IT Project Portfolio Selection in the Presence of Project Interactions. Universität Paderborn; 2015.
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Mutter T. On the Activating Power of Gamification –  Empirical Evidence from an Online Community. Universität Paderborn; 2015.
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Herrmann P. On Consumer Purchasing Behavior in Electronic Markets. Universität Paderborn; 2014.
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