VÄISÄNEN, R. A. Timing of waterfowl breeding on the Krunnit Islands, Gulf of Bothnia. Ornis Fennica, [S. l.], v. 51, n. 2, p. 61–84, 1974. Disponível em: https://ornisfennica.journal.fi/article/view/132862. Acesso em: 23 nov. 2024.