1. Soil Organic Matter And its Role in Crop Production;Allison,1973
2. Potential of stable isotope, 15N and 13C, methods for determining input and turnover in soils;Andreux,1990
3. Les datations par le 14C des matières organiques des sols. Contribution à l'étude de l'humification et du renouvellement des substances humiques;Balesdent;Sci. Sol.,1982
4. Natural 13C abundance as a tracer for studies of soil organic matter dynamics;Balesdent;Soil Biol. Biochem.,1987
5. Variations in the 13C/12C ratios of plants in relation to the pathway of photosynthetic carbon dioxide fixation;Bender;Phytochemistry,1971