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The Role of Product Involvement in Digital and Physical Reading - A comparative Study of Customer Reviews of eBooks vs. Printed Books
Wagner, T., (2012)
Converting freemium customers from free to premium - The role of the perceived premium fit in the case of music as a service
Wagner, T., (2014)
The Advertising Effect of Free - Do Free Basic Versions Promote Premium Versions within the Freemium Business Model of Music Services?
Wagner, T., (2013)