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Submitted on: 26 April 2002.
Revised on: 07 June 2002.
Accepted on: 06 July 2002.
___________________European Journal for Philosophy of Science
Submitted on: 17 October 2005.
Revised on: 13 February 2006.
Accepted on: 09 April 2006.
___________________European Journal for Philosophy of Science
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Submitted on: 18 February 2009.
Revised on: 14 March 2009.
Accepted on: 27 March 2009.
___________________European Journal for Philosophy of Science
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Submitted on: 01 November 2014.
Revised on: 28 February 2015.
Accepted on: 21 April 2015.
___________________European Journal for Philosophy of Science
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