4 IZA Discussion Papers
IZA Discussion Paper No. 8975
published in: American Economic Review, 2015, 105 (5), 346–351
IZA Discussion Paper No. 3132
revised version published as 'Incremental innovation and competitive pressure in the presence of discrete innovation' in: Journal of Economic Behavior and Organization, 2017, 135, 1-14
IZA Discussion Paper No. 491
published in: Defence and Peace Economics, 2003, 14 (3), 175-192
IZA Discussion Paper No. 478