Stewien, Klaus E., and José P. G. de Lacerda. “ Application of the Neutralization Index Comparison Technique to the Intratypic Serodifferentiation of Type 1 and 3 Poliovirus Strains, Using Hep-2 Cell Cultures ”. Revista de Saúde Pública 9, no. 2 (June 1, 1975): 221–228. Accessed May 16, 2024. https://www.revistas.usp.br/rsp/article/view/4789.