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Submitted on: 26 February 2004.
Revised on: 19 May 2004.
Accepted on: 13 June 2004.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
Submitted on: 13 October 2010.
Revised on: 12 November 2010.
Accepted on: 15 December 2010.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
Submitted on: 13 February 2001.
Revised on: 01 June 2001.
Accepted on: 18 June 2001.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
Submitted on: 22 July 2013.
Revised on: 13 August 2013.
Accepted on: 06 October 2013.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
Submitted on: 29 January 2013.
Revised on: 23 April 2013.
Accepted on: 04 June 2013.
___________________JOURNAL OF MATHEMATICAL BIOLOGY