Open access peer-reviewed chapter
By Nora Sandu, Fatemeh Momen-Heravi, Pooyan Sadr-Eshkevari, Ali Arvantaj and Bernhard Schaller
Submitted: March 15th 2011Reviewed: March 5th 2012Published: March 16th 2012
DOI: 10.5772/30107
Downloaded: 1621
© 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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