Kropyvka, Y., V. Bomko, and S. Kropyvka. “The Economic Efficiency of the Use of Mixed Ligand Complexes of Zinc, Manganese and Cobalt in the Rations of Highlyproductive Cows of the Ukrain-Ian Red-Spotted Dairy Breed”. Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies. Series: Agricultural Sciences, Vol. 23, no. 95, Dec. 2021, pp. 82-86, doi:10.32718/nvlvet-a9512.