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Submitted on: 11 November 2014.
Revised on: 23 February 2015.
Accepted on: 23 March 2015.
___________________ESAIM-Mathematical Modelling and Numerical Analysis
Submitted on: 08 June 2024.
Revised on: 01 September 2024.
Accepted on: 18 September 2024.
___________________ESAIM-Mathematical Modelling and Numerical Analysis
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