<bdi><a href="https://en.wikipedia.org/wiki/en:Carl_Strathmann" class="extiw" title="w:en:Carl Strathmann"><span title="German painter of Art Nouveau">Carl Strathmann</span></a>
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<a rel="nofollow" class="external text" href="https://www.invaluable.com/auction-lot/strathmann-carl-1866-duesseldorf-ebenda-1939-c5c09b0145">Hargesheimer Kunstauktionen, Düsseldorf, 15.03.2014, lot 254 via invaluable</a>