<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.kollerauktionen.ch/en/asp/fullCatalogue.asp?salelot=A158++++3213+&amp;refno=++419534&amp;saletype=">Koller Auktionen, 16 September 2013, Sale A158, Lot 3213</a>