5 IZA Discussion Papers
IZA Discussion Paper No. 16923
IZA Discussion Paper No. 15698
IZA Discussion Paper No. 9897
published as 'How Do Travel Costs Shape Collaboration?' in: Management Science, 2020, 66 (2), 3340-3360
IZA Discussion Paper No. 6476
IZA Discussion Paper No. 3417
published in: Economics Letters, 2011, 110 (3), 209-212