© Owned by the authors, published by EDP Sciences, 2014. This is an Open Access article distributed under the terms of the Creative Commons Attribution Lisence (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Ellei muuten mainita, aineiston lisenssi on © Owned by the authors, published by EDP Sciences, 2014. This is an Open Access article distributed under the terms of the Creative Commons Attribution Lisence (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.