POPOVA, LIUBOV 1889-1924 Birsk Landscape signed, c. 1916. Oil on canvas, 65 by 91 cm. Provenance: Dr. Mahmoud Vaja, Paris and Tehran, 1938. Authenticity certificate from Professor D Sarabianov and Andrey Sarabianov. Examination and Restoration report from Lars Bystrom, chief restorer of the Museum of Modern Art, S Letter from Lars Bystrom, dated 29 March 2007, reconfirming it is the same work that he had examined in 1994. Literature: Study for Birsk, 1916, gouache on paper reproduced in Adaskina and Sarabianov, Liubov Popova, Paris, p. 100, and ed. A. Z. Rudenstine, The Russian Avant-garde, NY, 1981, pl. 819. See written catalogue for full information. 500,000-700,000 Pounds