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Gewald, Heiko and Birkle, Matthias (2012) Open Innovation in the German SME Sector - Development and Test of a Diffusion Model. Progress in Machines and Systems (PMS), 1 (2). pp. 52-63.
Birkle, Matthias and Gewald, Heiko (2012) Open Innovation - Adoption Process and Current Status in German SMEs. In: (Proceedings of the) IEEE Conference on Digital Information Management (ICDIM), August, 22-24, 2012, Macau, China.