Simonov, M., V. Vlizlo, and I. Petruh. “Plasma Concentrations of Insulin-Like Growth Factor, Triiodothyronine, Thyroxine, and Insulin in Cows During Different Physiological States”. Agricultural Science and Practice, Vol. 3, no. 3, Dec. 2016, pp. 17-21, doi:10.15407/agrisp3.03.017.