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Submitted on: 19 July 2013.
Revised on: 17 September 2013.
Accepted on: 14 November 2013.
___________________COMPTES RENDUS PHYSIQUE---ACAD SCIENCES
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Submitted on: 10 January 2003.
Revised on: 26 April 2003.
Accepted on: 14 June 2003.
___________________COMPTES RENDUS PHYSIQUE---ACAD SCIENCES
Submitted on: 08 October 1999.
Revised on: 19 January 2000.
Accepted on: 24 February 2000.
___________________COMPTES RENDUS PHYSIQUE---ACAD SCIENCES
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