M. A. Jorge, J. D. Fábio, E. N. da Silva, and O. Hipólito, “Vaccination of broilers against chronic respiratory disease with the Conn. F strain of Mycoplasma gallisepticum”, PAB, vol. 20, no. 8, pp. 917–920, Oct. 2014, doi: 10.1590/S1678-3921.pab1985.v20.16037.