Prof. D. Horbachov in the Paris Branch of the Christie's Auctions attributed the abstract composition Colored Rhythms to O. Exter (October, 1990). Details...

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• Tretyakov Gallery (Moscow): dating of late Malevich's works.

• Russian Museum (Petersburg): dating of late Malevich's works.

• Modern Art Museum (New York): dating of Bogomazov's work "Sawdust carriers".

• Sotheby's Auction (Munich branch): attribution of works created by Bogomazov.

• Christie's Auction (Paris branch): attribution of works created by Exter.

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• MacDougall's Auction.

• Phillips Auction: attribution of works created by Exter, Bogomazov.

• National Art Museum of Ukraine (Kiev): attribution of works created by Exter, Grigîry Levitsky, Bogomazov, Sviatoslavsky, Malevich, Lisitsky, Meller.

• Museum of Theatre Art (Kiev): attribution and dating of works created by Petritsky.

• Bakhrushin Theatre Museum (Moscow): dating of works created by Petritsky and Meller.

• Literature Museum (Moscow): attribution of a placard of Petritsky.

• Modern Art Museum (Lodz): attribution of works created by Cybis.

• Lobanov-Rostovsky's Collection, London, curator of the collection is John Bowlt: attribution of works created by Petritsky, Khvostenko-Khvostov, Ermilov, Tyshler.