Vierteljahrshefte zur Wirtschaftsforschung, Vol. 87 (2018), Iss. 1 : pp. 81–91 | First published online: October 19, 2018
Sozialer Fortschritt, Vol. 67 (2018), Iss. 8-9 : pp. 759–782 | First published online: September 13, 2018
Vierteljahrshefte zur Wirtschaftsforschung, Vol. 76 (2007), Iss. 4 : pp. 35–46 | First published online: October 03, 2017