0. (Brugge), Desclée de Brouwer, 1956, in-4°, 69 pp, orig.wrapper, sewn, 23 plates. Study on the 16th century edition of ''Pictorum Aliquot Celebrium Germaniae Inferioris Effigies'', Antwerp, J.Cock, 1572 which showed the portraits of 15th and 16th century painters from the Low Countries.
0. S.l. (Bruges), Desclée de Brouwer, 1950, in-4°, 119 pp, sewn, orig. wrappers, printed in 550 copies. This humanist and art critic from Liège played an important role on the artistic scene. He had contacts with Vasari.