Submitted on: 01 April 2013.
Revised on: 22 June 2013.
Accepted on: 05 August 2013.
___________________Communications in Mathematical Biology and Neuroscience
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Submitted on: 30 April 1999.
Revised on: 26 July 1999.
Accepted on: 29 August 1999.
___________________Communications in Mathematical Biology and Neuroscience
Submitted on: 24 May 2006.
Revised on: 04 July 2006.
Accepted on: 15 July 2006.
___________________Communications in Mathematical Biology and Neuroscience
Submitted on: 05 December 2006.
Revised on: 13 March 2007.
Accepted on: 30 March 2007.
___________________Communications in Mathematical Biology and Neuroscience
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Submitted on: 03 December 2009.
Revised on: 01 April 2010.
Accepted on: 15 April 2010.
___________________Communications in Mathematical Biology and Neuroscience