>Jef Verheyen, Copy of 'ZERO' (ed. Heinz Mack & Otto Piene, 1961) from the artist’s library. Third and final issue of the periodical, titled ‘Dynamo’, 1967.Book, ink on paper.
>Galerie Ursula Lichter, Jef Verheyen, Invitation to 'DYNAMO ZERO 1959-1969' in Galerie Ursula Lichter, Frankfurt am Main, 1969.Invitation Card, ink on paper.
>Galerie Denise Réne Hans Mayer, Jef Verheyen, Set of postcards with historical ZERO exhibitions, published by Galerie Denise Réne Hans Mayer, Düsseldorf, 1970.Postcard, ink on postcards.