Sotheby's auction of $180m Van Gogh challenged over claims it was 'sold under duress'CultureNov 14 at 1:00 PM – Nov 15 at 12:30 AM3 outletsBBC NewsSotheby's auction of $180m Van Gogh challenged over claims it was 'sold under duress' Nov 14 at 1:00 PMCNBC$180 million Van Gogh tests the art market and collector confidence Nov 14 at 5:34 PMIrish IndependentSale of $180m Van Gogh in doubt after Nazi duress claim Nov 15 at 12:30 AM