MIKKOLA, H.; SULKAVA, S. On the occurrence of the Great Grey Owl (Strix nebulosa) in Finland 1955–68. Ornis Fennica, [S. l.], v. 46, n. 3, p. 126–131, 1969. Disponível em: https://ornisfennica.journal.fi/article/view/132769. Acesso em: 13 sep. 2024.