Advances in Earth Science ›› 2007, Vol. 22 ›› Issue (12): 1311-1315. doi: 10.11867/j.issn.1001-8166.2007.12.1311

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  • Received:2007-11-02 Revised:2007-11-20 Online:2007-12-10 Published:2007-12-10
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