Erste Solvay-Konferenz von 1911.
<a href="https://en.wikipedia.org/wiki/de:Max_Planck" class="extiw" title="w:de:Max Planck">Max Planck</a>
<bdi><a href="https://www.wikidata.org/wiki/Q33206336" class="extiw" title="d:Q33206336"><span title="photographer">Benjamin Couprie</span></a>
</bdi>
<bdi><a href="https://www.wikidata.org/wiki/Q33206336" class="extiw" title="d:Q33206336"><span title="photographer">Benjamin Couprie</span></a>
</bdi>