PALMGREN, P. Zur nistökologischen Analyse dreier Waldvogelarten, Fringilla coelebs L., Regulus regulus (L.) und Carduelis spinus (L.). Ornis Fennica, [S. l.], v. 9, n. 2, p. 33–37, 1932. Disponível em: https://ornisfennica.journal.fi/article/view/132278. Acesso em: 15 may. 2024.