Magalhães, Helena, et al. “Occurrence, Bacteriological and Histopathological Aspects of Colibacillosis in Calves”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 4, Apr. 1991, pp. 555-64, doi:10.1590/S1678-3921.pab1991.v26.3376.