© The Author(s) (published by University of Bucharest)

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Accepted version:

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 Open Access Journal

Published version:

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 Open Access Journal

Remarks:
 the Author and the Publisher agree to grant the following Creative Commons copyright license in the Article to the general public: Creative Commons Attribution Non-Commercial No Derivatives 2.5 License, which is incorporated herein by reference and is further specified at http://creativecommons.org/licenses/by-nc-nd/2.5/legalcode.

Verification Date:

  23.12.2013