BONCZAR, Z.; SWENSON, J. E. Geographical variation in spotting patterns on Hazel Grouse Bonasa bonasia primary feathers: consequences for age determination. Ornis Fennica, [S. l.], v. 69, n. 4, p. 193–197, 1992. Disponível em: https://ornisfennica.journal.fi/article/view/133355. Acesso em: 22 nov. 2024.