http://reply.papertrans.cn/4/302/30199/30199-11.png
Submitted on: 13 December 2002.
Revised on: 23 January 2003.
Accepted on: 10 February 2003.
Urban Forum---SPRINGERNATURE
http://reply.papertrans.cn/4/302/30199/30199-13.png
http://reply.papertrans.cn/4/302/30199/30199-14.png
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http://reply.papertrans.cn/4/302/30199/30199-16.png
Submitted on: 24 January 2006.
Revised on: 07 March 2006.
Accepted on: 25 March 2006.
Urban Forum---SPRINGERNATURE
http://reply.papertrans.cn/4/302/30199/30199-18.png
Submitted on: 19 July 2000.
Revised on: 04 August 2000.
Accepted on: 28 August 2000.
Urban Forum
Submitted on: 17 July 2013.
Revised on: 13 August 2013.
Accepted on: 22 August 2013.
Urban Forum---SPRINGERNATURE