Complaint says work could lose $3m in value as a result

Auction house seeks dismissal of lawsuit

A Léger and a Basquiat belonging to Edemar Cid Ferreira have been identified

Banksy’s rise from street artist to gallery star, embraced by the commercial art world, is by no means unique

Treasures from behind the secret door

Jablonka is running concurrent shows on two giants of the 20th century

Jablonka, Cologne

A number of small shows devoted to the artist have opened across the city

New paintings at Hamiltons for those who have so far missed out

Centro de Arte Reina Sofía plays host to three big names on one canvas

Photographs by the wigged Sphinx of Manhattan are published by his old dealer

Fontana moves from Hayward exhibition to commercial gallery, Basquiat’s drawings come to the City and the centenary of the charming Ardizzone is celebrated

And a group of exhibitions, about Duchamp, Balthus and Basquiat, coincides with new art book releases this autumn

His record price may bolster the market, but not all artists surpassed expectations

Bringing together Picasso and Kapoor, Louise Bourgeois and Basquiat, Lam and the new Latin Americans, Jean-Hubert Martin and Achille Bonito Oliva

David D’Arcy reviews the rash of films about art and artists now being made in the US

The artist's complicated oeuvre makes it hard to judge if some works are forged - or if instead he was just having an off day

Music Television and Madonna sponsor her late lover

Whitney director, David Ross, gambles on his political correctness

Baghoomian vanishes while Basquiat paintings remain missing

A busy month for Brussels

The artist's life story will soon be a minor motion picture, but cinema-goers could be disenchanted with such dramatisations