KORPIMÄKI, E.; HUHTALA, K. Nest visit frequences and activity patterns of Ural Owls Strix uralensis. Ornis Fennica, [S. l.], v. 63, n. 2, p. 42–46, 1986. Disponível em: https://ornisfennica.journal.fi/article/view/133203. Acesso em: 18 sep. 2024.