Christian Dotremont, 10 rue de la Paille Bruxelles, with poem (pamphlet) published on the occasion of the 20th anniversary of Cobra, Bruxelles 1968, 170 x 135 mm.; Virtus Schade, Cobra van kop tot staart, Schelderode, België, 1972; various catalogues on Cobra exhibitions in Belgium and Italy; and writings about Cobra by Charles Etienne and Joseph Noiret (9)