Paraense, W. Lobato, and Lygia R. Corrêa. 1973. “Susceptibility of Biomphalaria Peregrina from Brazil and Ecuador to Two Strains of Schistasoma Mansoni”. Revista Do Instituto De Medicina Tropical De São Paulo 15 (3): 127-30. https://revistas.usp.br/rimtsp/article/view/200846.