Helmut Schober : Light / - Fath, Manfred; Gercke, Hans; Herbst, Helmut; Hofstede, Justus Müller; Müller, Wolfgang; Oberhuber, Konrad; Riedl, Peter Anselm; Ronte, Dieter; Schroeder, Veronika; Zorn, Elmar (Electa, 1998)