DRUZIUK, R. and DENEFIL, O. Changes of electrocardiograms of animals with epinephrine heart damage in influences of stress and castration. Journal of Education, Health and Sport. Online. 5 March 2023. Vol. 14, no. 1, pp. 50-58. [Accessed 27 January 2025]. DOI 10.12775/JEHS.2023.14.01.006.