共 3 条
- [1] The Use of Isotopes in Soil Organic Matter Studies Persamon. Van Dijk,H. New York. N.Y . 1966
- [2] Decture Note on Soil Chemistry and Fertility.University of Gent. Verloo,M. Belgium . 1996
- [3] Humic Subotances in the environment.Marcel Dekker. Schultzer,M. and Khan,S.U. New York . 1972