Received date: 2007-07-12
Revised date: 2007-12-11
Online published: 2008-02-25
Supported by
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WU Jing,WANG Zheng . null[J]. Acta Geographica Sinica, 2008 , 63(2) : 185 -194 . DOI: 10.11821/xb200802008
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