The link between gross profitability and pharmaceutical R&D spending.
暂无分享,去创建一个
[1] Henry G. Grabowski,et al. A New Look at the Returns and Risks to Pharmaceutical R&D , 1990 .
[2] F. Scherer,et al. Demand-Pull and Technological Invention: Schmookler Revisited , 1982 .
[3] Yoram Barzel,et al. Optimal Timing of Innovations , 1968 .
[4] Henry G. Grabowski,et al. The Determinants of Industrial Research and Development: A Study of the Chemical, Drug, and Petroleum Industries , 1968, Journal of Political Economy.