3 IZA Discussion Papers
IZA Discussion Paper No. 15037
IZA Discussion Paper No. 12035
published as 'Microfirms and innovation in the service sector' in: Small Business Economics, 2020, 55 (4), 997-1018
IZA Discussion Paper No. 9734
published in: Research Policy, 2016, 45 (6), 1263–1274