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Submitted on: 08 September 2000.
Revised on: 13 December 2000.
Accepted on: 06 February 2001.
___________________BIOLOGICAL CYBERNETICS---SPRINGER
Submitted on: 24 September 2013.
Revised on: 16 November 2013.
Accepted on: 29 December 2013.
___________________BIOLOGICAL CYBERNETICS---SPRINGER
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Submitted on: 15 August 2015.
Revised on: 13 November 2015.
Accepted on: 01 December 2015.
___________________BIOLOGICAL CYBERNETICS---SPRINGER
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Submitted on: 22 September 2009.
Revised on: 08 January 2010.
Accepted on: 13 February 2010.
___________________BIOLOGICAL CYBERNETICS---SPRINGER