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Submitted on: 29 October 2004.
Revised on: 04 February 2005.
Accepted on: 04 April 2005.
___________________APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
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Submitted on: 01 April 2017.
Revised on: 15 July 2017.
Accepted on: 09 September 2017.
___________________APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION