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Submitted on: 23 April 2001.
Revised on: 30 May 2001.
Accepted on: 14 June 2001.
Romanian Journal of Transport Infrastructure
http://reply.papertrans.cn/3/274/27328/27328-33.png
Submitted on: 14 December 2018.
Revised on: 31 December 2018.
Accepted on: 18 January 2019.
NULL
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http://reply.papertrans.cn/3/274/27328/27328-36.png