HILDÉN, O.; HELO, P. The Great Grey Owl Strix nebulosa-a bird of the northern taiga. Ornis Fennica, [S. l.], v. 58, n. 4, p. 159–166, 1981. Disponível em: https://ornisfennica.journal.fi/article/view/133079. Acesso em: 23 nov. 2024.