Open access peer-reviewed chapter
By Katrin Blondal and Sigridur Halldorsdottir
Submitted: March 14th 2011Reviewed: August 7th 2011Published: January 18th 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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