PULLIAINEN, E.; HAKANEN, R. Parental care of a pair of Pine Grosbeaks Pinicola enucleator during the nestling period. Ornis Fennica, [S. l.], v. 49, n. 3–4, p. 86–90, 1972. Disponível em: https://ornisfennica.journal.fi/article/view/132841. Acesso em: 9 jul. 2025.