Submitted on: 02 August 2004.
Revised on: 14 September 2004.
Accepted on: 10 October 2004.
___________________ESAIM-Mathematical Modelling and Numerical Analysis
Submitted on: 17 December 2015.
Revised on: 03 February 2016.
Accepted on: 28 March 2016.
___________________ESAIM-Mathematical Modelling and Numerical Analysis
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Submitted on: 14 November 2022.
Revised on: 04 February 2023.
Accepted on: 14 February 2023.
___________________ESAIM-Mathematical Modelling and Numerical Analysis
Submitted on: 25 August 2016.
Revised on: 17 November 2016.
Accepted on: 08 December 2016.
___________________ESAIM-Mathematical Modelling and Numerical Analysis
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Submitted on: 24 December 2018.
Revised on: 11 April 2019.
Accepted on: 13 May 2019.
___________________ESAIM-Mathematical Modelling and Numerical Analysis
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Submitted on: 16 March 1999.
Revised on: 11 May 1999.
Accepted on: 21 June 1999.
___________________ESAIM-Mathematical Modelling and Numerical Analysis