5 IZA Discussion Papers
IZA Discussion Paper No. 15937
IZA Discussion Paper No. 15706
IZA Discussion Paper No. 15081
IZA Discussion Paper No. 8896
published in: Oxford Handbook on the Economics of Networks, 2016, 277 - 302
IZA Discussion Paper No. 5779
published in: Journal of Human Resources, 2014, 49 (4), 872-905