<bdi><a href="https://www.wikidata.org/wiki/Q18639868" class="extiw" title="d:Q18639868"><span title="German painter (1818-1884)">Paul Franken</span></a>
</bdi>
<a href="https://en.wikipedia.org/wiki/Christie%27s" class="extiw" title="en:Christie's">Christie's</a>, LotFinder:  entry  <a rel="nofollow" class="external text" href="https://www.christies.com/LotFinder/lot_details.aspx?intObjectID=5818612">5818612</a> (sale 2868, lot 82, New York, 26 - 27 August 2014)