HILDÉN, O.; HILDÉN, M. Wide fluctuations in the Finnish population of the Great Grey Shrike Lanius excubitor during recent decades. Ornis Fennica, [S. l.], v. 73, n. 1, p. 35–38, 1996. Disponível em: https://ornisfennica.journal.fi/article/view/133436. Acesso em: 13 may. 2024.