1. Grass, grazing animals, and man in historical perspective;Barnard,1964
2. Potential nitrogen immobilization in grassland soils across as soil organic matter gradient;Barrett;Soil Biology and Biochemistry,2000
3. Nitrogen availability indices;Bundy,1994
4. Organic matter turnover in a sagebrush steppe landscape;Burke;Biochemistry,1988
5. Coping with herbivory: photosynthetic capacity and resource allocation in two semiarid Agropyron bunchgrasses;Caldwell;Oecologia,1981