<bdi><a href="https://en.wikipedia.org/wiki/en:Ernst_Koerner" class="extiw" title="w:en:Ernst Koerner"><span title="German painter (1846-1927)">Ernst Koerner</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=5938576">5938576</a> (sale 3782, lot 64, New York, 28 Oct 2015)