1. Vaccines 2004 W.B. Saunders R. W. Sutter O. M. Kew S. L. Cochi S. A. Plotkin W. A. Orenstein Poliovirus vaccine—Live 651 705
2. World Health Organization. (2005).Global Polio Eradication Initiative. Available athttp://www.polioeradication.org/ accessed September 26 2005.
3. World Health Organization. (2004).Global Polio Eradication Initiative: Progress 2003. Report No.: WHO/Polio/04.01 Geneva .
4. Policy decision options during the first 5 years following certification of polio eradication;Sangrujee N.;Medscape General Medicine,2003
5. World Health Organization. (1998).Report of the Meeting on the Scientific Basis for Stopping Polio Immunization. Report No.: WHO/EPI/GEN/98.12 Geneva : World Health Organization .