An independent Swiss report has described the quality of the existing provenance research into the Emil G. Bührle Collection as ‘superficial’ and full of ‘false results’. The report by Raphael Gross, president of the Deutsches Historisches Museum Foundation, was commissioned in May 2023 by the canton and city of Zurich and the board of the Kunsthaus Zürich. The latter accepted a long-term loan of
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