JÄRVINEN, O.; VÄISÄNEN, R. A.; HAILA, Y. Estimating relative densities of breeding birds by the line transect method. III. Temporal constancy of the proportion of main belt observations. Ornis Fennica, [S. l.], v. 53, n. 2, p. 40–45, 1976. Disponível em: https://ornisfennica.journal.fi/article/view/132896. Acesso em: 9 may. 2024.