<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-spanish-painting-the-orientalist-sale-and-german-austrian-scandinavian-and-symbolist-works-l09663/lot.5.lotnum.html">Sotheby's, London, 24 November 2009, lot 5</a>