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Journal of Zhejiang University-SCIENCE A > 2000 > 1 > 1 > 111-118
Agriculture and Human Values > 1998 > 15 > 3 > 223-242
Journal of Zhejiang University-SCIENCE A > 2000 > 1 > 1 > 111-118
Agriculture and Human Values > 1998 > 15 > 3 > 223-242