Open access peer-reviewed chapter
By Risto Kangas
Submitted: June 15th 2011Reviewed: February 1st 2012Published: March 28th 2012
DOI: 10.5772/38225
Downloaded: 2839
© 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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