<bdi><a href="https://en.wikipedia.org/wiki/en:Carl_Blechen" class="extiw" title="w:en:Carl Blechen"><span title="German painter (1798-1840)">Carl Blechen</span></a>
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<a rel="nofollow" class="external text" href="http://www.kettererkunst.de/kunst/kd/details.php?obnr=113000922&amp;anummer=402">Ketterer Kunst 14 May 2013, auction 402, lot 597</a>