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2. - Poliomyelitis in the world;C. &; DROZDOV S.G.;Bull Wld. Hlth Org.,1970
3. - Genetic markers of poliovirus strains isolated from paralytic patients prior to and after Sabin vaccination programs: I Studies on type 1 strains;FURESZ J.;Amer. J. Hyg.,1964
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