M. Bozhilova-Sakova, I. Dimitrova, T. Ivanova, V. Koutev, and M. Ignatova, “POLYMORPHISM OF ABCG2 GENE AND ITS EFFECTS ON LITTER SIZE AND MILK PRODUCTION OF SYNTHETIC POPULATION BULGARIAN MILK EWES”, Tradit. Mod. Vet. Med., vol. 7, no. 1, pp. 44–48, Jun. 2022.