Takeda, A. K., V. C. Rossi, J. M. de P. Diniz, M. das G. F. Adelino, and A. Taunay. “Antibodies to Polysaccharide of Neisseria Meningitidis, Serogroups A and C in Normal Vaccinated Persons and in Paiients With Meningococcal Diseases Previously Vaccinated or Not”. Instituto Adolfo Lutz Journal - RIAL, vol. 35, no. 1-2, Dec. 1976, pp. 139-46, doi:10.53393/rial.1975.35.37085.