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Submitted on: 14 October 2010.
Revised on: 03 December 2010.
Accepted on: 12 January 2011.
___________________Journal of Inverse and Ill-Posed Problems
Submitted on: 15 July 2007.
Revised on: 08 September 2007.
Accepted on: 06 October 2007.
___________________Journal of Inverse and Ill-Posed Problems
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