Nikolai Petrovich Bogdanov-Belsky (1868-1945), RUSSIAN, TWO GIRLS ON A SWING, 1940, signed N. Bogdanoff-Belsky (lower right), oil on canvas mounted on board, 33 3/4 by 27 1/2 in. or 85.5 by 70 cm., Source: Sotheby's (detail)