1. US Department of Health and Human Services, Food and Drug?Administration Web site. What are generic drugs? Available at: http://www.fda.gov/Drugs/ResourcesForYou/Consumers/BuyingUsingMedicineSafely/UnderstandingGenericDrugs/ucm144456.htm. Accessed April 4, 2011.
2. The patents-based pharmaceutical development process: rationale, problems, and potential reforms;Barton;JAMA,2005
3. The price of innovation: new estimates of drug development costs;DiMasi;J Health Econ,2003
4. The cost of biopharmaceutical R&D: is biotech different?;DiMasi;Manage Decis Econ,2007
5. US Department of Health and Human Services, Office of Science and Data Policy Web site. ASPE issue brief: expanding the use of generic drugs. Available at: http://aspe.hhs.gov/sp/reports/2010/GenericDrugs/ib.pdf. Accessed April 12, 2011.