http://reply.papertrans.cn/1/62/6162/6162-21.png
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Submitted on: 12 September 2002.
Revised on: 23 December 2002.
Accepted on: 10 January 2003.
___________________COMPTES RENDUS MECANIQUE---ACAD SCIENCES
Submitted on: 17 July 2013.
Revised on: 12 November 2013.
Accepted on: 19 December 2013.
___________________COMPTES RENDUS MECANIQUE---ACAD SCIENCES
http://reply.papertrans.cn/1/62/6162/6162-25.png
http://reply.papertrans.cn/1/62/6162/6162-26.png
Submitted on: 12 October 2003.
Revised on: 22 January 2004.
Accepted on: 16 March 2004.
___________________COMPTES RENDUS MECANIQUE---ACAD SCIENCES
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