J. Tőzsér, F. L. Kézér, L. Kovács, and N. Fazekas, “Evaluation of animal-based parameters of welfare in two Hungarian dairy farms using principal component analysis”, ANIM WELFARE ETOL TARTÁSTECHN, vol. 16, no. 2, pp. 177–188, Dec. 2020, doi: 10.17205/SZIE.AWETH.2020.2.177.