LAAKSONEN, M.; LEHIKOINEN, E. Age determination of Willow and Crested Tits Parus montanus and P. cristatus. Ornis Fennica, [S. l.], v. 53, n. 1, p. 9–14, 1976. Disponível em: https://ornisfennica.journal.fi/article/view/132893. Acesso em: 17 touko. 2024.