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http://reply.papertrans.cn/4/302/30200/30200-12.png
http://reply.papertrans.cn/4/302/30200/30200-13.png
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Submitted on: 23 March 2008.
Revised on: 03 May 2008.
Accepted on: 21 May 2008.
URBAN GEOGRAPHY
http://reply.papertrans.cn/4/302/30200/30200-20.png