Submitted on: 27 March 2020.
Revised on: 17 July 2020.
Accepted on: 01 September 2020.
___________________INVERSE PROBLEMS---IOP PUBLISHING LTD
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Submitted on: 16 June 2011.
Revised on: 27 July 2011.
Accepted on: 08 August 2011.
___________________INVERSE PROBLEMS---IOP PUBLISHING LTD