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- [2] 北京山区坡面土壤流失方程研究[D]. 毕小刚.北京林业大学 2007
- [3] Agriculture Handbook No 537. Wischmeier W H, Smith D D. United States Department of Agriculture(USDA) . 1978
- [4] Agricultural Handbook No.282. Wischmeier WH, Smith DD. U.S.Department of Agriculture . 1965