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Submitted on: 29 November 2009.
Revised on: 01 February 2010.
Accepted on: 24 March 2010.
___________________Foundations of Science---SPRINGER
Submitted on: 17 September 2013.
Revised on: 09 October 2013.
Accepted on: 30 October 2013.
___________________Foundations of Science---SPRINGER
Submitted on: 20 August 2014.
Revised on: 20 October 2014.
Accepted on: 04 December 2014.
___________________Foundations of Science---SPRINGER
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