1. Adams, J.D., Clemmons, J.R. (2008). The origins of industrial scientific discovery. National Bureau of Economic Research Working Paper, No. 13823.
2. Cockburn, I. M., & Henderson, R. (1996). Public-private Interaction in Pharmaceutical Research. Proceedings of the National Academy of Sciences of the United States of America, 93, 12725–12730.
3. Cockburn, I. M., & Henderson, R. (2000). Publicly funded science and the productivity of the pharmaceutical industry. Innovation Policy and the Economy, 1, 1–34.
4. Zucker G. Z., Darby, M. R., & Brewer, M. B., (1998). Intellectual human capital and the birth of U.S. biotechnology enterprises. American Economic Review, 88(1).
5. DiMasi, J. A., & Paquette, C. (2004). The economics of follow-on drug research and development: Trends in entry rates and the timing of development. Pharmacoeconomics, 22(2), 1–14.