ERIKSSON, K. On the occurrence of the Grasshopper Warbler (Locustella naevia) and River Warbler (L. fluviatilis) in Finland related to the bird watching activity. Ornis Fennica, [S. l.], v. 46, n. 3, p. 113–125, 1969. Disponível em: https://ornisfennica.journal.fi/article/view/132768. Acesso em: 23 nov. 2024.