Martins Filho, J., A. F. Pestana de Castro, M. B. Serafim, and J. A. Gomes. 1980. “Anti-Thermolabile Escherichia Coli Enterotoxin and Anti-Colonization Factor Antibodies Found in Human Colostrum”. Revista Do Instituto De Medicina Tropical De São Paulo 22 (1): 7-14. https://revistas.usp.br/rimtsp/article/view/197272.