[2] WHO. Trace Elements in Human Nutrition and Health. Geneva, Switzerland: World Health Organization, 1996. 1.
[12] Li B Y, Zhou D M, Cang L, et al. Soil and Tillage Research, 2007, 96(1): 166.
[2] WHO. Trace Elements in Human Nutrition and Health. Geneva, Switzerland: World Health Organization, 1996. 1.
[12] Li B Y, Zhou D M, Cang L, et al. Soil and Tillage Research, 2007, 96(1): 166.
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