Dupak, V., and V. Popelnyukh. “Aspects of Winter Communal Roosts of Corvus Species in Poltava City”. The Journal of V.N.Karazin Kharkiv National University. Series «Biology» 29, no. 2 (1): 151-158. Accessed April 25, 2024. https://periodicals.karazin.ua/biology/article/view/10471.