Immunoglobulin a antibodies to trypanosoma cruzi antigens in digestive forms of chagas' disease - Primavera, Katia Schelini da Costa; Hoshino-Shimizu, Sumie; Umezawa, Eufrosina Setsu; Peres, Benedito Anselmo; Manigot, D A; Camargo, Mario Endsfeldz (Journal of Clinical Microbiology, 1988)