JÄRVINEN, O.; VÄISÄNEN, R. A. Species diversity of Finnish birds, I: Zoogeographical zonation based on land birds. Ornis Fennica, [S. l.], v. 50, n. 3–4, p. 93–125, 1973. Disponível em: https://ornisfennica.journal.fi/article/view/132855. Acesso em: 9 may. 2024.