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Submitted on: 29 July 2010.
Revised on: 06 September 2010.
Accepted on: 17 October 2010.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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Submitted on: 07 May 2004.
Revised on: 21 August 2004.
Accepted on: 16 October 2004.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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Submitted on: 05 April 2009.
Revised on: 26 April 2009.
Accepted on: 07 May 2009.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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