Identifies a fragment of a head of a young woman on the verso of a German drawing of the head of a man (Frankfurt, Städel Museum) as a study by Leonardo for the Madonna Litta (Leningrad, Hermitage).
Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d'une licence CC BY 4.0 / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 license