Farid, A., Refai, M., M. El-Shinnawy, and H. Badr,  " Spectrum of Escherichia coli agglutinins in dams serum, colostrum and calf serum in Fresian cows and buffaloes in Egypt. ",  Zbl. Bakt. Hyg. I., Abt. Orig. A , vol. 245, , pp. 262-268 , 1979.