Asami, Keizo, et al. “Incidence of Hookworm and Strongyloides Infection in Pernambuco. A Survey Based on Identification of Larvae”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 12, no. 1, Feb. 1970, pp. 31-35, https://revistas.usp.br/rimtsp/article/view/199563.