Open access peer-reviewed chapter
By Anna Lyra and Sampo Lahtinen
Submitted: February 1st 2011Reviewed: July 21st 2011Published: January 5th 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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