Alfieri, A. A., Alfieri, A. F., Freitas, J. C. de, Silva, C. A. da, Freire, R. L., Barros, A. R., … Muller, E. E. (1994). Ocurrence of Escherichia Coli, rotavirus, picobirnavirus and Cryptosporidium Parvum in a postweaning diarrhoea focus in swinw. Semina: Ciências Agrárias, 15(1), 5–7. https://doi.org/10.5433/1679-0359.1994v15n1p5