Advances in Earth Science ›› 2004, Vol. 19 ›› Issue (6): 1002-1005. doi: 10.11867/j.issn.1001-8166.2004.06.1002

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  • Received:2004-10-03 Revised:2004-11-01 Online:2004-12-20 Published:2004-12-01
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