H. . Štenclová, F. . Karásek, O. . Šťastní­k, L. . Zeman, E. . Mrkvicová, and L. . Pavlata, “The effect of reduced zinc levels on performance parameters of broiler chickens”, Potr. S. J. F. Sci., vol. 10, no. 1, pp. 272–275, May 2016.