Reliability of the line survey method in bird census, with reference to Reed bunting and Sedge warbler

Haukioja, E. (1968). Reliability of the line survey method in bird census, with reference to Reed bunting and Sedge warbler. Ornis Fennica, 45(4), 105–113. Noudettu osoitteesta https://ornisfennica.journal.fi/article/view/132748