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ZfKE – Zeitschrift für KMU und Entrepreneurship, Vol. 63 (2015), Iss. 2 : pp. 129–147 | First published online: November 22, 2017
Der Betriebswirt, Vol. 53 (2012), Iss. 3 : pp. 29–34 | First published online: July 02, 2019