1. Qualitative response models: A survey;Amemiya;Journal of Economic Literature,1981
2. Research and development costs and returns: The U.S. pharmaceutical industry;Baily;Journal of Political Economy,1972
3. The changing costs and risks of pharmaceutical innovation;Clymer,1970
4. Analysis of survival data;Cox,1984
5. Halving the pain of budget balance;Feldstein;Wall Street Journal,1988