<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.sothebys.com/de/auctions/ecatalogue/2009/19th-century-european-paintings-including-german-austrian-central-european-paintings-the-orientalist-sale-spanish-painting-and-the-scandinavian-sale-l09661/lot.7.html">Sotheby's, London, 03 June 2009, lot 7</a>