PONCE DE LEÓN, Patricia, et al. “ Relation Between Buccal Protozoa and PH and Salivary IgA in Patients With Dental Prothesis ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 43, no. 4, Aug. 2001, pp. 241-2, https://revistas.usp.br/rimtsp/article/view/30535.