1. Empirical studies of innovation and market structure;Cohen,1989
2. Sources, procedures and microeconomic effects of innovation;Dosi;Journal of Economic Literature,1988
3. The Economics of Industrial Innovation;Freeman,1982
4. Time paths in the diffusion of product innovations;Gort;Economic Journal,1982
5. Patent statistics as economic indicators: A survey;Griliches;Journal of Economic Literature,1990