1. The influence of demand and supply side pressures on the quantity and quality of inventive activity;Bosworth,1982
2. Who does R&D and who patents?;Bound,1981
3. Returns to scale in research and development: What does the Schumpeterian hypothesis imply?;Fisher;Journal of Political Economy,1973
4. Patentwesen und technischer Fortschritt;Grefermann,1974
5. Econometric models for count data with an application to the patents-R&D relationship;Hausman,1981