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Submitted on: 27 August 2014.
Revised on: 03 November 2014.
Accepted on: 01 January 2015.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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Submitted on: 30 March 2001.
Revised on: 27 May 2001.
Accepted on: 22 June 2001.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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Submitted on: 21 February 2020.
Revised on: 17 May 2020.
Accepted on: 27 June 2020.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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Submitted on: 20 January 1999.
Revised on: 17 May 1999.
Accepted on: 05 July 1999.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
Submitted on: 14 September 2018.
Revised on: 07 December 2018.
Accepted on: 28 January 2019.
___________________JOURNAL OF MATHEMATICAL BIOLOGY