A. V. Oliyar, P. M. Skliarov, D. M. Masiuk, D. D. Bilyi, V. V. Logvinova, and M. A. Lieshchova, “Effect of β-mannanase enzyme supplementation on the morphofunctional state of broiler chickens’ immunocompetent organs ”, Regul. Mech. Biosyst., vol. 11, no. 4, pp. 579-587, Nov. 2020.