Article in OASE 43 by Hilde Heynen.
Edition 20, 1992. The magazine is published four times a year.
Article about an exhibition of the Experimentele Groep Holland in de Bijenkorf in 1949 by Graham Birtwistle in Jong Holland nr. 5, 1988.
Interview with Constant in the run-up to the exhibition Constant | Werk uit de periode 1975-1985 in Centraal Museum Utrecht.
Short notification in Kunstecho's about the Tate Gallery's acquisition of the work, Après Nou La Liberté, 1949.
Article by Mathilde Visser on three exhibitions with Constant's work in Amsterdam in 1978: Aquarellen en tekeningen at Galerie d'Art, Schilderijen 1969-77 at Stedelijk Museum and Constant | Grafiek at Printshop Piet Clement.
Article by Erik Slagter on the Cobra group in the quarterly magazine, Septentrion, 1/1975. Septentrion represents a view of the literary, cultural and social life in Flanders and the Netherlands. Also it pays attention to the relations between the French speaking and Dutch speaking world since 1972.
Article on Constant and New Babylon by Fanny Kelk for Insight Holland in the Holland Herald, Edition 12, nr 11, 1977