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Sozialer Fortschritt, Vol. 65 (2016), Iss. 11 : pp. 247–253 | First published online: October 03, 2017
Vierteljahrshefte zur Wirtschaftsforschung, Vol. 78 (2009), Iss. 3 : pp. 188–201 | First published online: October 03, 2017
Vierteljahrshefte zur Wirtschaftsforschung, Vol. 89 (2020), Iss. 1 : pp. 115–132 | First published online: March 25, 2020
