18-colour Silkscreen with pressings on white file paper from the Galvani Paper-Mill - From the portfolio: "Counterpoints - 7 visual notations by Accardi, Boetti, Buren, Kounellis, LeWitt, Paolini and Pistoletto" published by A.E.I.O.U Edizioni d'arte (Rome) edited by Bruno Corà. - Bibliography: Graphic impressions. The graphic work 1967-1992 by Giulio Paolini, Marco Noire Editore, Turin 1992, cat. n. 68.