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Open access peer-reviewed chapter
By Marina Spînu, Anca Elena Gurzău, Carmen Dana Șandru, Gabriel Gati and Mihaela Niculae
Submitted: April 25th 2017Reviewed: October 23rd 2017Published: January 31st 2018
© 2018 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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