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Submitted on: 21 December 2001.
Revised on: 09 April 2002.
Accepted on: 09 May 2002.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
Submitted on: 10 February 1998.
Revised on: 03 May 1998.
Accepted on: 20 June 1998.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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