- Robert Gober, On Kawara, Mike Kelley, Martin Kippenberger, Jeff Koons, Albert Oehlen, Julian Schnabel, Cindy Sherman, Thomas Struth, Philip Taaffe, Christopher Wool
- Galerie Max Hetzler Thomas Borgmann, Köln, 1992
- hardcover
- Ask
- Robert Gober, On Kawara, Mike Kelley, Martin Kippenberger, Jeff Koons, Albert Oehlen, Julian Schnabel, Cindy Sherman, Thomas Struth, Philip Taaffe, Christopher Wool
- Galerie Max Hetzler Thomas Borgmann, Köln, 1992
- hardcover
- Ask
Robert Gober, On Kawara, Mike Kelley, Martin Kippenberger, Jeff Koons, Albert Oehlen, Julian Schnabel, Cindy Sherman, Thomas Struth, Philip Taaffe, Christopher Wool
contexts：
- Christopher Wool. Vol. 1: 2006-2008 / Vol. 2: Porto-Köln
- Friedrich Julia / Ulrich Loock
- Walther König, Köln, 2009 ⁄ softcover
- Ask
- Pop In
- Martin Kippenberger
- Forum Stadtpark, 1987 ⁄ 7" record ⁄ edition of 500
- Ask
- Salon nr.6, Januar 1979
- Gerhard Theewen
- Salon Verlag, 1979 ⁄ softcover ⁄ Albert Oehlen, Alessandro, Antonius Höckelmann, Bernd Minnich, Bernhard Johannes Blume, Bruce Mclean, Chaques Charlier, Chris Burden, Cioni Carpi, Didier Bay, Gerhard P. Päs, Giulio Paolini, H.P. Adamski, Hans-Peter Feldmann, Harry Hoogstraten, Helmut M. Federle, Holger Bunk, James Collins, Klaus Richter, Marcel Odenbach, Markus Oehlen, Martin Disler, Michel S, Mimmo Paladino, Pieter Holstein, Reinhard Mucha, Robert Barry, Walter Dahn, Walter Pfeiffer
- Ask
- Salon nr.5, September 1978
- Gerhard Theewen
- Salon Verlag, 1978 ⁄ softcover ⁄ Allessandro, Luciano Bartolini, Jacques Charlier, Bruce McLean, Reinhard Mucha, Albert Oehlen, Gerhard Theewen, Titus, Ecki Vespa, Robert Wilhite
- Ask