HAUKIOJA, E. Reliability of the line survey method in bird census, with reference to Reed bunting and Sedge warbler. Ornis Fennica, [S. l.], v. 45, n. 4, p. 105–113, 1968. Disponível em: https://ornisfennica.journal.fi/article/view/132748. Acesso em: 18 maj. 2024.