Castro, Ceyla M.O., et al. “ Molecular and Seroepidemiologic Studies of Enterovirus 71 Infection in the State of Pará, Brazil ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 47, no. 2, Apr. 2005, pp. 65-71, https://revistas.usp.br/rimtsp/article/view/30888.