›› 2006, Vol. 23 ›› Issue (1): 91-96.DOI: 10.7523/j.issn.2095-6134.2006.1.019
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GUO Teng-Yun, XU Yong, YANG Guo-An
1 Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2 Graduate School, Chinese Academy of Sciences, Beijing 100039, China