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Submitted on: 08 April 2005.
Revised on: 02 May 2005.
Accepted on: 23 May 2005.
SIAM Journal on Imaging Sciences
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Submitted on: 18 April 1999.
Revised on: 31 May 1999.
Accepted on: 05 June 1999.
SIAM Journal on Imaging Sciences
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Submitted on: 19 September 2012.
Revised on: 05 October 2012.
Accepted on: 21 October 2012.
SIAM Journal on Imaging Sciences
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