Open access peer-reviewed chapter
By Annu Näkki, Minna Männikkö and Janna Saarela
Submitted: March 18th 2011Reviewed: July 25th 2011Published: February 22nd 2012
DOI: 10.5772/30451
Downloaded: 1520
© 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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