LIND, E. A.; PEIPONEN, V. A. Nistkasten-Beobachtungen in den Birkenregion von Finnisch-Lappland. Ornis Fennica, [S. l.], v. 40, n. 2, p. 72–75, 1963. Disponível em: https://ornisfennica.journal.fi/article/view/132685. Acesso em: 13 may. 2024.