BRITTAS, R.; MARCSTRÖM, V. Studies in Willow Grouse Lagopus lagopus of some possible measures of condition in birds. Ornis Fennica, [S. l.], v. 59, n. 4, p. 157–169, 1982. Disponível em: https://ornisfennica.journal.fi/article/view/133108. Acesso em: 18 may. 2024.