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Journal of Zhejiang University-SCIENCE A > 2005 > 6 > 7 > 683-688
Journal of Zhejiang University-SCIENCE A > 2005 > 6 > 7 > 683-688
Journal of Zhejiang University-SCIENCE A > 2005 > 6 > 7 > 683-688
Journal of Zhejiang University-SCIENCE A > 2005 > 6 > 7 > 683-688