<bdi><a href="https://en.wikipedia.org/wiki/en:Nicholas_Roerich" class="extiw" title="w:en:Nicholas Roerich"><span title="Russian painter, writer, archaeologist and philosopher (1874–1947)">Nicholas Roerich</span></a>
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<a href="https://en.wikipedia.org/wiki/Christie%27s" class="extiw" title="en:Christie's">Christie's</a>, LotFinder:  entry  <a rel="nofollow" class="external text" href="https://www.christies.com/LotFinder/lot_details.aspx?intObjectID=5274853">5274853</a> (sale 7772, lot 429, London, 1 - 2 December 2009)