Barranco, Dolores González, and Mario Salazar Mallén. “Medical Geography of Onchocercosis. Genus Onchocerca, DIESING”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 10, no. 5, Oct. 1968, pp. 316-25, https://revistas.usp.br/rimtsp/article/view/201706.