Grigorova, Natalia, et al. “INFLUENCE OF THE MULTIENZYMATIC PREPARATIONS HOSTAZYM C 100 AND HOSTAZYM X 100 ON SOME BIOCHEMICAL PARAMETERS IN THE BLOOD OF YEARLING RAMS”. Bulgarian Journal of Animal Husbandry, vol. 47, no. 3, June 2010, pp. 33-41, https://agriacad.eu/ojs/index.php/bjah/article/view/779.