Detection of Cryptosporidium oocysts in groundwater utilized for consumption in Itaquaquecetuba, S.Paulo-Brazil - Gamba, R. C.; Ciapina, E M P; Batello, E R; Espindola, R S; Pacheco, Alberto; Pellizari, Vivian Helena (International Symposium on Microbial Ecology - ISME, 1998)