Vico, J. P., and R. C. Mainar-Jaime. “Serological Survey of Salmonella Spp. Infection in Finishing Pigs from Northeastern Spain and Associated Risk Factors”. Spanish Journal of Agricultural Research, Vol. 10, no. 2, Apr. 2012, pp. 372-8, doi:10.5424/sjar/2012102-446-11.