"Akt", (the reverse of the painting Maternity), after 1890, oil on cardboard, private property. Source: Kopszak, Piotr, "Olga Boznańska [1865-1940]", from the series "PEOPLE TIME OF THE WORK", Edipresse Polska S.A., Warsaw 2006, ISBN 83-7477-056-2 [http://artyzm.com/obraz.php?id=12602]