Signature in the bottom right corner. Exhibition: 1991, Franco Angeli and Renato Mambor, 60s-70s Route, Galleria Ducale, Modena, 25 May - 30 June. & Nbsp; Bibliography: 1991, M. Calvesi, Franco Angeli and Renato Mambor, 60s-70s Route , Galleria Ducale, Modena, repr. & Nbsp;
Authenticated by the Franco Angeli Archive, with the number: D-020320/252.