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Submitted on: 25 September 2012.
Revised on: 03 January 2013.
Accepted on: 10 February 2013.
___________________Ekonomika i Matematiceskie Metody-Economics and Mathematical Methods
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Submitted on: 06 September 2005.
Revised on: 30 September 2005.
Accepted on: 06 November 2005.
___________________Ekonomika i Matematiceskie Metody-Economics and Mathematical Methods
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Submitted on: 06 April 2016.
Revised on: 16 May 2016.
Accepted on: 09 July 2016.
___________________Ekonomika i Matematiceskie Metody-Economics and Mathematical Methods