Submitted on: 05 February 2011.
Revised on: 19 March 2011.
Accepted on: 04 May 2011.
___________________Contemporary Economics---UNIV ECONOMICS & HUMAN SCIENCES WARSAW
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Submitted on: 10 August 2020.
Revised on: 21 October 2020.
Accepted on: 27 November 2020.
___________________Contemporary Economics---UNIV ECONOMICS & HUMAN SCIENCES WARSAW
Submitted on: 23 November 2008.
Revised on: 17 March 2009.
Accepted on: 11 May 2009.
___________________Contemporary Economics---UNIV ECONOMICS & HUMAN SCIENCES WARSAW
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Submitted on: 26 October 2005.
Revised on: 28 November 2005.
Accepted on: 14 December 2005.
___________________Contemporary Economics---UNIV ECONOMICS & HUMAN SCIENCES WARSAW