G. Semenov, Vladimir, et al. “Realization of Meat Qualities of Black Motley Bull-Calves Against the Background of Immunoprophylaxis With Biological Preparations”. International Journal of Engineering & Technology, vol. 7, no. 4.28, Nov. 2018, pp. 648-55, https://doi.org/10.14419/ijet.v7i4.28.28337.