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Submitted on: 01 January 2000.
Revised on: 08 February 2000.
Accepted on: 31 March 2000.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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http://reply.papertrans.cn/2/179/17893/17893-24.png
Submitted on: 18 November 2011.
Revised on: 16 December 2011.
Accepted on: 25 January 2012.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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Submitted on: 08 October 2001.
Revised on: 26 November 2001.
Accepted on: 13 December 2001.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
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Submitted on: 07 March 2001.
Revised on: 20 May 2001.
Accepted on: 10 June 2001.
___________________JOURNAL OF MATHEMATICAL BIOLOGY
Submitted on: 03 February 2000.
Revised on: 27 February 2000.
Accepted on: 13 April 2000.
___________________JOURNAL OF MATHEMATICAL BIOLOGY