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Der Betriebswirt, Vol. 54 (2013), Iss. 2 : pp. 15–19 | First published online: June 26, 2019
Vierteljahrshefte zur Wirtschaftsforschung, Vol. 81 (2012), Iss. 4 : pp. 9–27 | First published online: October 03, 2017