FERREIRA, C. S.; AMATO NETO, V.; ALARCÓN, R. S. R.; GAKIYA, E. Identification of Cryptosporidium Spp. Oocysts in Fecal Smears Stained With Heidenhain’s Iron Hematoxylin . Rev. Inst. Med. Trop. São Paulo 2001, 43 (6), 341-342.