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Submitted on: 02 March 2013.
Revised on: 17 June 2013.
Accepted on: 25 July 2013.
___________________COMPTES RENDUS PHYSIQUE---ACAD SCIENCES
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Submitted on: 06 May 2003.
Revised on: 03 July 2003.
Accepted on: 09 August 2003.
___________________COMPTES RENDUS PHYSIQUE---ACAD SCIENCES
Submitted on: 10 December 1999.
Revised on: 20 February 2000.
Accepted on: 11 April 2000.
___________________COMPTES RENDUS PHYSIQUE---ACAD SCIENCES
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Submitted on: 25 October 2014.
Revised on: 04 January 2015.
Accepted on: 15 February 2015.
___________________COMPTES RENDUS PHYSIQUE---ACAD SCIENCES
Submitted on: 16 January 2015.
Revised on: 27 March 2015.
Accepted on: 22 April 2015.
___________________COMPTES RENDUS PHYSIQUE---ACAD SCIENCES