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Submitted on: 19 February 2000.
Revised on: 05 June 2000.
Accepted on: 15 July 2000.
___________________IMA JOURNAL OF APPLIED MATHEMATICS
Submitted on: 15 March 2012.
Revised on: 28 June 2012.
Accepted on: 25 July 2012.
___________________IMA JOURNAL OF APPLIED MATHEMATICS
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Submitted on: 30 November 2016.
Revised on: 02 January 2017.
Accepted on: 12 February 2017.
___________________IMA JOURNAL OF APPLIED MATHEMATICS
Submitted on: 05 May 2007.
Revised on: 15 July 2007.
Accepted on: 04 September 2007.
___________________IMA JOURNAL OF APPLIED MATHEMATICS
Submitted on: 21 August 1998.
Revised on: 30 November 1998.
Accepted on: 19 January 1999.
___________________IMA JOURNAL OF APPLIED MATHEMATICS
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