FOX, A. D.; KOBRO, S.; LEHIKOINEN, A.; LYNGS, P.; VÄISÄNEN, R. A. Northern Bullfinch Pyrrhula p. pyrrhula irruptive behaviour linked to rowanberry Sorbus aucuparia abundance. Ornis Fennica, [S. l.], v. 86, n. 2, p. 51–60, 2009. Disponível em: https://ornisfennica.journal.fi/article/view/133721. Acesso em: 16 may. 2024.