Szentléleki, Andrea, et al. “Investigation of Behaviour and Reproduction Ability in Horned and Polled Charolais Sire Candidates”. Animal Welfare, Ethology and Housing Systems (AWETH), vol. 1, no. 2, Aug. 2005, pp. 110-2, https://journal.uni-mate.hu/index.php/aweth/article/view/6950.