Torres, Domingas M. A. Grispino Vieira, et al. “ Giardiasis in Day Nurseries Supported by Municipal Prefecture of São Paulo (Brazil), 1982 1983 ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 33, no. 2, Apr. 1991, pp. 137-42, https://revistas.usp.br/rimtsp/article/view/28805.