d'Alencar, Alessandra Santos, et al. “Sanitary Management and Pulmonary Lesions in Pigs in Metropolitan Recife and the Coastal Zone of the State of Pernambuco, Brazil”. Semina: Ciências Agrárias, vol. 32, no. 3, Aug. 2011, pp. 1111-22, doi:10.5433/1679-0359.2011v32n3p1111.