1. Chemical Analysis of Ecological Materials;Allen,1974
2. Handledning i växtekologisk fält och laboratoriemetodik;Anderson,1971
3. Nutrient cycling in two Danish beech forests growing on different soil types;Astrup;Holarctic Ecol.,1979
4. Some aspects of the effects of grazing on the nutrition of pastures;Barrow;J. Aust. Inst. Agric. Sci.,1967
5. Changes in the species composition in an area dominated by Deschampsia flexuosa (L.) Trin. as a result of cattle grazing;Büllow-Olsen;Biol. Cons.,1980