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Curators at an Israeli museum have discovered three previously unknown sketches by celebrated 20th-century artist Amedeo Modigliani hiding beneath the surface of one of his paintings.

Christie's has a lineup of 20th-century masterpieces by Lucian Freud, Amedeo Modigliani, Pablo Picasso and Roy Lichtenstein that will come to auction this fall Works by some of the most coveted artists of impressionist and modern art are coming to auction this fall, including two major works by Paul Gauguin.