REINIKAINEN, A. The irregular migrations of the Crossbill, Loxia c. curvirostra, and their relation to the cone-crop of the Conifers. Ornis Fennica, [S. l.], v. 14, n. 2, p. 55–64, 1937. Disponível em: https://ornisfennica.journal.fi/article/view/132364. Acesso em: 18 may. 2024.