Art & Project (Firma) (1968-2001)(1)
Exhibition Live in Your Head, when Attitudes Become Form, Works - Concepts - Processes - Situations - Information (1969 : Bern) (1969-)(1)
Galerie Heiner Friedrich (1967-1974)(1)
Konrad Fischer Galerie (1997-)(1)
Kunsthalle Bern (1918-) (1)
Städtisches Museum Mönchengladbach (1904-1982)(1)