Human infection by phagicola sp. ( Trematoda , heterophyidae ) in the municipality of registro, sao paulo state, brazil - Chieffi, Pedro Paulo; Gorla, M C O; Torres, D M A G V; Dias, R. M. D. S.; Mangini, A C S; Monteiro, A; Woiciechoviski, E (Journal of Tropical Medicine and Hygiene, 1992)