Lopez, J. C., R. Mcfarlane, and J. Ulloa. “Detection and Characterization of Infectious Bronchitis Virus in Chile by RT-PCR and Sequence Analysis”. Archivos De Medicina Veterinaria, vol. 38, no. 2, Aug. 2006, pp. 175-8, doi:10.4067/S0301-732X2006000200012.