http://reply.papertrans.cn/3/299/29860/29860-11.png
http://reply.papertrans.cn/3/299/29860/29860-12.png
http://reply.papertrans.cn/3/299/29860/29860-13.png
http://reply.papertrans.cn/3/299/29860/29860-14.png
http://reply.papertrans.cn/3/299/29860/29860-15.png
http://reply.papertrans.cn/3/299/29860/29860-16.png
http://reply.papertrans.cn/3/299/29860/29860-17.png
Submitted on: 21 March 2014.
Revised on: 26 April 2014.
Accepted on: 20 May 2014.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
http://reply.papertrans.cn/3/299/29860/29860-19.png
Submitted on: 28 January 2004.
Revised on: 09 February 2004.
Accepted on: 21 February 2004.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT