HILDÉN, O. Mass irruption of Long-tailed Tits Aegithalos caudatus in Northern Europe in 1973. Ornis Fennica, [S. l.], v. 54, n. 2, p. 47–65, 1977. Disponível em: https://ornisfennica.journal.fi/article/view/132928. Acesso em: 23 nov. 2024.