Origlia, J., K. Suzuki, L. Castro, M. Faccioli, M. Silva, J. Caballero, O. Valiente, and F. Alvarez. 2009. “Bayesian Mapping for Infectious Bronchitis Virus Risk in Backyard Chickens in Paraguay”. International Journal of Poultry Science 8 (8): 740–745. https://doi.org/10.3923/ijps.2009.740.745.