Ποιος χρονολόγησε Hélène Oettingen;

Léopold Frédéric Léopoldowitsch Survage (French pronunciation: [leɔpɔl(d) syʁvaʒ]; 31 July 1879 – 31 October 1968) was a Russian-French painter of Finnish origin. Trained in Moscow, he identified with the Russian avant-garde before moving to Paris, where he shared a studio with Amedeo Modigliani and experimented with abstract films. He also gained commissions for Serge Diaghilev's Ballets Russes.