1. Intellectual property rights shaping innovation in services;Andersen,2000
2. Productivity and innovation in services: an international comparative perspective;van Ark,1997
3. Does productivity converge across countries and across sectors? Empirical evidences from eight OECD countries;Atella,1995
4. Towards a theory of innovation in services;Barras;Research Policy,1986
5. Die nachindustrielle Gesellschaft;Bell,1976