2014
'The Leopold Museum, which holds the piece in its collection, has vehemently defended against the accusations. It maintains that a provenance investigation conducted jointly with the Austrian Culture Ministry in 2010 proved that the painting was sold after the end of World War II by Mathilde Lukacs, Grünbaum’s sister in law, to the Swiss art dealer Eberhard W. Kornfeld. Provenance researcher Dr. Sonja Niederacher subsequently concluded that there was no case for restitution. To further deter the Grünbaums, the Vienna institution has now gone on the offensive, stating that it “reserves the right to take legal action” against the heirs if they continue to claim that they are the rightful owners of Tote Stadt III. '
- "Leopold Museum Defends Against Restitution Claims" by Henri Neuendorf date: November 5, 2014, ArtNet
