<bdi><a href="https://en.wikipedia.org/wiki/en:Ludwig_Knaus" class="extiw" title="w:en:Ludwig Knaus"><span title="German artist (1829–1910)">Ludwig Knaus</span></a>
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<a rel="nofollow" class="external text" href="http://www.arcadja.com/auctions/de/private/knaus_ludwig/kunstwerken/15533/0/">Van Ham Kunstauktionen, 24.10.2012, lot 235 via ARCADJA auction results</a>