Exhibition catalogue published in conjunction with exhibition held at the Stedelijk Museum, Amsterdam, June 2 - 25, 1962. Traveled to Stedelijk van Abbemuseum, Eindhoven, September 14 - October 12, 1962 ; Stedelijk Museum, Schiedam, November 2 - December 3, 1962 ; Groninger Museum, December 22, 1965 - January 20, 1963. Includes black-and-white images and texts by the artists. Texts in Dutch.