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"Sigmar Polke, Untitled (Rorschach) (Ohne Titel (Rorschach)) (circa 1999). Private Collection.\nPhoto: Alistair Overbruck \u00A9 2014 Estate of Sigmar Polke/ Artists Rights Society (ARS), New York / VG Bild-Kunst, Bonn."^^<http://www.w3.org/2001/XMLSchema#string>
<https://news.artnet.com/market/art-market-analysis-sigmar-polke-vs-anselm-kiefer-at-auction-9154>