1. US group urges immunisation change;Frankel;Lancet,1995
2. Paralytic poliomyelitis: seasoned strategies, disappearing disease;Hull;Lancet,1994
3. Interrupting the transmission of wild polioviruses with vaccines: immunologic considerations;Ghendon;Bull World Health Organ,1994
4. Oral poliovirus vaccine in tropical Africa: greater impact on incidence of paralytic disease than expected from coverage surveys and seroconversion rates;Heymann;Bull World Health Organ,1987
5. Certification of poliomyelitis eradication-the Americas, 1994;Expanded Programme on Immunization;Weekly Epidemiol Rec,1994