JÄRVINEN, O.; VÄSÄINEN, R. A.; HAILA, Y. Bird census results in different years, stages of the breeding season and times of the day. Ornis Fennica, [S. l.], v. 54, n. 3, p. 108–118, 1977. Disponível em: https://ornisfennica.journal.fi/article/view/132939. Acesso em: 23 nov. 2024.