Open access peer-reviewed chapter
By Ambrosi Pertia, Laurent Managadze and Archil Chkhotua
Submitted: February 8th 2011Reviewed: September 3rd 2011Published: February 3rd 2012
© 2012 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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