Exhibition catalogue published in conjunction with show held at the Kölnisches Stadmuseum, September 7 - October 20, 1996. Edited by Werner Schäfke and Michael Euler-Schmidt, with written contributions by Hansen, Heike Hoffmann, Jürgen Raap, and Jürgen H. Meyer. Includes chronology, exhibition and action history, and bibliography. Printed in black-and-white. Text in German.