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2. Smallpox surveillance-worldwide;MMWR Morb Mortal Wkly Rep,1997
3. Centers for Disease Control and Prevention. Progress toward poliomyelitis eradication-Europe and Central Asian Republics, 1991-September 1997. MMWR Morb Mortal Wkly Rep. 1997;46:994-1000.
4. Estimating immunization coverage from school-based childhood immunization records;Murphy;Pediatr Infect Dis J.,1995
5. Adequacy of well-child care and immunizations in U.S. infants born in 1988;Mustin;JAMA,1994