 Consequently, in 1971 they bought back the Degas "Deux Danseuses" for far below its worth.In December 1987, while reading at the Frick Museum in New York, Elaine Rosenberg found the painting "Portrait of Gabrielle Diot" by Degas listed for sale in an art magazine at the Mathias F. Hans Gallery in Hamburg.The listing included the fact that it had come to the current owner via the dealership of Paul Rosenberg.