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Submitted on: 20 May 2011.
Revised on: 19 July 2011.
Accepted on: 28 August 2011.
___________________Journal of Inverse and Ill-Posed Problems
Submitted on: 29 August 2013.
Revised on: 04 October 2013.
Accepted on: 17 October 2013.
___________________Journal of Inverse and Ill-Posed Problems
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Submitted on: 25 October 2013.
Revised on: 20 November 2013.
Accepted on: 31 December 2013.
___________________Journal of Inverse and Ill-Posed Problems
Submitted on: 04 July 2014.
Revised on: 19 September 2014.
Accepted on: 10 October 2014.
___________________Journal of Inverse and Ill-Posed Problems