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; Camargo, Mario Endsfeldz; Manigot, D (Encontro Norte-Nordeste de Imunologia, 1987)