Max-Planck-Institut für Festkörperforschung
<a rel="nofollow" class="external text" href="https://web.archive.org/web/20161031085056/http://www.panoramio.com/user/596286?with_photo_id=125656292">qwesy qwesy</a>
CC BY 3.0
<a rel="nofollow" class="external free" href="https://web.archive.org/web/20161031085054/http://www.panoramio.com/photo/125656292">https://web.archive.org/web/20161031085054/http://www.panoramio.com/photo/125656292</a>