© 2015 by Research-publishing.net (collective work). Authors. All articles in this collection are published under the Attribution-NonCommercial -NoDerivatives 4.0
International (CC BY-NC-ND 4.0) licence. Under this licence, the contents are freely available online (as PDF
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publisher are properly cited. Commercial use and derivative works are, however, not permitted.
Ellei muuten mainita, aineiston lisenssi on © 2015 by Research-publishing.net (collective work). Authors. All articles in this collection are published under the Attribution-NonCommercial -NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Under this licence, the contents are freely available online (as PDF files) for anybody to read, download, copy, and redistribute provided that the author(s), editorial team, and publisher are properly cited. Commercial use and derivative works are, however, not permitted.