1. Några fågelarters boplatsval under hög smågnagartäthet i fjällbjörkskog;Arheimer;Fauna och Flora,1974
2. Territory quality and reproductive success: can water pipits Anthus spinoletta assess the relationship reliably?;Bollman;Ardea,1997
3. Ruddy duck nesting success: do nest characteristics deter nest predation?;Brua;Condor,1999
4. Estimation of density from line transect sampling of biological populations;Burnham;Wildlife Monogr.,1980