TYRVÄINEN, H. The winter irruption of the Fieldfare Turdus pilaris and the supply of rowan-berries. Ornis Fennica, [S. l.], v. 52, n. 1, p. 23–31, 1975. Disponível em: https://ornisfennica.journal.fi/article/view/132877. Acesso em: 23 nov. 2024.