Submitted on: 28 May 2006.
Revised on: 15 September 2006.
Accepted on: 01 October 2006.
___________________Bulletin of Geography-Socio-Economic Series
http://reply.papertrans.cn/1/44/4319/4319-22.png
http://reply.papertrans.cn/1/44/4319/4319-23.png
Submitted on: 23 April 2005.
Revised on: 11 July 2005.
Accepted on: 20 August 2005.
___________________Bulletin of Geography-Socio-Economic Series
http://reply.papertrans.cn/1/44/4319/4319-25.png
http://reply.papertrans.cn/1/44/4319/4319-26.png
Submitted on: 24 February 2006.
Revised on: 28 March 2006.
Accepted on: 26 May 2006.
___________________Bulletin of Geography-Socio-Economic Series
http://reply.papertrans.cn/1/44/4319/4319-28.png
Submitted on: 05 February 2014.
Revised on: 26 February 2014.
Accepted on: 18 March 2014.
___________________Bulletin of Geography-Socio-Economic Series
http://reply.papertrans.cn/1/44/4319/4319-30.png