共 3 条
- [1] Research and development and productivity: Evidence from Danish firm-level data[J] . International Advances in Economic Research . 2000 (2)
- [2] R&D and productivity: A broad cross-section cross-country look[J] . Bart Verspagen.Journal of Productivity Analysis . 1995 (2)
- [3] R&D,Patents and Productivity .2 Cuneo,P,Mairesse,J. University ofChicago Press . 1984