Alfieri, A. A.; Alfieri, A. F.; Freitas, J. C. de; Silva, C. A. da; Freire, R. L.; Barros, A. R.; Barreiros, M. A. B.; Muller, E. E. Ocurrence of Escherichia Coli, Rotavirus, Picobirnavirus and Cryptosporidium Parvum in a Postweaning Diarrhoea Focus in Swinw. Semina: Ciênc. Agrár. 1994, 15, 5-7.