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2. Poliomyelitis surveillance summary 1980-1981;Centers for Disease Control,1982
3. Immunization Practices Advisory Committee. Poliomyelitis prevention;Centers for Disease Control;MMWR,1982
4. Use of a modified Wecker technique for the serodifferentiation of type 1 polioviruses related and unrelated to Sabin's vaccine strain. I. Standardization and evaluation of the test;Nakano;Am J Hyg,1962
5. Use of a modified Wecker technique for serodifferentiation of type 1 polioviruses related and unrelated to Sabin's vaccine strain. II. Antigenic segregation of isolates from specimens collected in field studies;Nakano;Am J Hyg,1963