Daza, A., J. Riopérez, I. Ovejero, and C. de Alba. “Productive Performance of the Single Farrowing System for Pigs”. Spanish Journal of Agricultural Research 3, no. 1 (March 1, 2005): 83-89. Accessed August 2, 2026. https://sjar.revistas.csic.es/index.php/sjar/article/view/127.