Barretto, M.P. (1963) “Diagncsis of chronic amebiasis. II. Comparative study of the efficiency of the zinc sulfate centrifugal-floatation technic, in successive stool specimens and of the examination of purged stools, used either separately or in combination”, Revista do Instituto de Medicina Tropical de São Paulo, 5(1), pp. 1–11. Available at: https://revistas.usp.br/rimtsp/article/view/202337 (Accessed: 8 July 2024).