3 IZA Discussion Papers
IZA Discussion Paper No. 12305
forthcoming in: Journal of Human Resources
IZA Discussion Paper No. 7382
revised version published as 'The Value of Hiring through Employee Referrals' in: Quarterly Journal of Economics, 2015, 130(2), 805-839
IZA Discussion Paper No. 6044
published in: Social Science and Medicine, 2013, 88, 18-29