Estimating relative densities of breeding birds by the line transect method. IV. Geographical constancy of the proportion of main belt observations

Järvinen, O., & Väisänen, R. A. (1976). Estimating relative densities of breeding birds by the line transect method. IV. Geographical constancy of the proportion of main belt observations. Ornis Fennica, 53(3), 87–91. https://ornisfennica.journal.fi/article/view/132905