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Submitted on: 23 June 2009.
Revised on: 16 October 2009.
Accepted on: 04 December 2009.
___________________Journal of Science and Arts---EDITURA BIBLIOTHECA-BIBLIOTHECA PUBL HOUSE
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Submitted on: 28 June 2007.
Revised on: 27 September 2007.
Accepted on: 22 October 2007.
___________________Journal of Science and Arts---EDITURA BIBLIOTHECA-BIBLIOTHECA PUBL HOUSE
Submitted on: 07 November 2015.
Revised on: 04 March 2016.
Accepted on: 18 April 2016.
___________________Journal of Science and Arts---EDITURA BIBLIOTHECA-BIBLIOTHECA PUBL HOUSE
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