Submitted on: 21 July 2007.
Revised on: 17 October 2007.
Accepted on: 22 November 2007.
___________________ESAIM-CONTROL OPTIMISATION AND CALCULUS OF VARIATIONS
Submitted on: 07 June 2004.
Revised on: 05 August 2004.
Accepted on: 03 October 2004.
___________________ESAIM-CONTROL OPTIMISATION AND CALCULUS OF VARIATIONS
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Submitted on: 23 November 2016.
Revised on: 14 January 2017.
Accepted on: 13 March 2017.
___________________ESAIM-CONTROL OPTIMISATION AND CALCULUS OF VARIATIONS