Perdomo, C. C.; Fernandes, L. C. de O.; Guidoni, A. L.; Fialho, F. B. Effect of Natural and Mechanical Ventilation on Performance of Lactation Sows. PAB 1999, 34 (4), 691-699. https://doi.org/10.1590/S1678-3921.pab1999.v34.5218.