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Sozialer Fortschritt, Vol. 68 (2019), Iss. 8–9 : pp. 701–729 | First published online: September 03, 2019
Vierteljahrshefte zur Wirtschaftsforschung, Vol. 83 (2014), Iss. 2 : pp. 95–113 | First published online: October 03, 2017