Marcel Broodthaers, "M.B. M.B. M.B....", 1970, Ink on paper in artist's frames, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37802

Marcel Broodthaers, Journal d'un voyage utopique, 1973, Ink, colored ink, and lithograph on four pieces of paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33475