1.
Järvinen O, Väisänen RA. Estimating relative densities of breeding birds by the line transect method. IV. Geographical constancy of the proportion of main belt observations. Ornis Fenn [Internet]. 1976Sep.30 [cited 2024Nov.23];53(3):87–91. Available from: https://ornisfennica.journal.fi/article/view/132905