FÖRSCHLER, M. I.; FÖRSCHLER, L.; DORKA, U. Population fluctuations of Siskins Carduelis spinus, Common Crossbills Loxia curvirostra, and Citril Finches Carduelis citrinella in relationship to flowering intensity of spruce Picea abies. Ornis Fennica, [S. l.], v. 83, n. 2, p. 91–96, 2006. Disponível em: https://ornisfennica.journal.fi/article/view/133659. Acesso em: 9 may. 2024.