Атемасова, Т. А., and А. А. Атемасов. “Features of the Genesis of the Avifauna on the Border of Forest-Steppe and Steppe Natural Zones”. The Journal of V.N.Karazin Kharkiv National University. Series «Biology», Vol. 25, 1, pp. 124-36, https://periodicals.karazin.ua/biology/article/view/5570.