Shows of some of the paintings have been put on in the Hermitage and in the Pushkin Museum in Moscow.

ECONOMIST: Walter Farmer

Russia denied it had the treasure until 1993 - then in 1996 it put necklaces, bracelets and other objects from the collection on display at Moscow's Pushkin Museum.

BBC: Website traces war booty

There is a newspaper article from Pravda about the 1955 exhibit at Moscow's Pushkin Museum, the first and only time the painting was exhibited publicly in the Soviet Union.

WSJ: The Sistine Madonna | Old Masters Picture Gallery | The Madonna Above the Cherubs | By A.J. Goldmann