Submitted on: 01 September 2013.
Revised on: 21 October 2013.
Accepted on: 04 December 2013.
___________________COMPTES RENDUS MECANIQUE---ACAD SCIENCES
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Submitted on: 06 January 2013.
Revised on: 30 March 2013.
Accepted on: 15 April 2013.
___________________COMPTES RENDUS MECANIQUE---ACAD SCIENCES
Submitted on: 06 February 2017.
Revised on: 15 March 2017.
Accepted on: 26 March 2017.
___________________COMPTES RENDUS MECANIQUE---ACAD SCIENCES
Submitted on: 08 July 2014.
Revised on: 18 October 2014.
Accepted on: 10 November 2014.
___________________COMPTES RENDUS MECANIQUE---ACAD SCIENCES
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