Khorin, B., A. Danilova, N. Labutina, D. Yurin, and N. Yurina. “Effect of the Brown Coal-Based Feed Additive on Poultry Productivity Indicators”. KnE Life Sciences, Vol. 6, no. 3, Apr. 2021, pp. 710–718, doi:10.18502/kls.v0i0.9008.