1. Forest structure: a key to the ecosystem;TA Spies;Northwest science,1998
2. On Bird Species Diversity;RH MacArthur;Ecology,1961
3. Carey AB, Hardt MM, Horton SP, Biswell BL. Spring bird communities in the Oregon Coast Range. USDA Forest Service general technical report PNW-GTR-Pacific Northwest Research Station (USA). 1991;
4. A forest structure habitat index based on airborne laser scanning data;NC Coops;Ecological Indicators,2016
5. Herb layer vegetation of south Swedish beech and oak forests—effects of management and soil acidity during one decade;J Brunet;Forest Ecology and Management,1996