KOSKIMIES, J. Delayed departure of the swift (Apus apus) from Finland in the autumn of 1957. Ornis Fennica, [S. l.], v. 38, n. 3–4, p. 105–127, 1961. Disponível em: https://ornisfennica.journal.fi/article/view/132665. Acesso em: 17 sep. 2024.