1. World Health Organization. Assessing the Global Needs for Vaccine Research and Development. World Health Organization, Geneva, Switzerland (2000).
2. Mercer Management Consulting. Lemons Learned: New Procurement Strategies for Vaccines: Final Report to the GA VI Board. Mercer Management Consulting, IL, USA (2002).
3. Grabowski H, Vernon J. The Search for New Vaccines: the Effects of the Vaccines for Children Program. AEI Press, DC, USA (1997).
4. General Accounting Office. Childhood Vaccines: Ensuring an Adequate Supply Poses Continuing Challenges. US General Accounting Office, DC, USA (2002).
5. New estimates of drug development costs