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Sozialer Fortschritt, Vol. 67 (2018), Iss. 2 : pp. 99–112 | First published online: March 14, 2018
Vierteljahrshefte zur Wirtschaftsforschung, Vol. 87 (2018), Iss. 2 : pp. 77–93 | First published online: December 21, 2018