C. C. Perdomo, L. C. de O. Fernandes, A. L. Guidoni, and F. B. Fialho, “Effect of natural and mechanical ventilation on performance of lactation sows”, PAB, vol. 34, no. 4, pp. 691–699, Apr. 1999, doi: 10.1590/S1678-3921.pab1999.v34.5218.