Scollo, Annalisa, et al. “Improvement of Animal Welfare in Lactating Sows Reared Outdoor in Mediterranean Area”.
Acta Agraria Kaposváriensis
, vol. 14, no. 2, Feb. 2010, pp. 229-35,
https://journal.uni-mate.hu/index.php/aak/article/view/2008
.