Sacchi, Claudio Tavares, et al. “ Genetic Structure of Neisseria Meningitidis Serogroup C Epidemic Strains in South Brazil ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 37, no. 4, Aug. 1995, pp. 281-9, https://revistas.usp.br/rimtsp/article/view/29278.