BOEV, Z.; MIKKOLA, H. First Pleistocene Record of Great Grey Owl (Strix nebulosa Forster, 1772) in Bulgaria. Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 75, n. 5, p. 680–685, 2022. DOI: 10.7546/CRABS.2022.05.07. Disponível em: https://proceedings.bas.bg/index.php/cr/article/view/80. Acesso em: 1 jul. 2022.