(selection)
- When Attitudes Become Form ( Kunsthalle, Bern, 1969.)
- The New Sculpture 1965-75 ( Whitney Museum of Art, New York, 1990.)
- Collecciòn Sonnabend (Centro d’Arte Reina Sofia, Madrid, 1988.)
- Warhol-Basquiat.Clemente ( Museum Friedericianum, Kassel, 1996.)
- Abstract Art in the Late XXth Century ( Cambridge University, 2002.)
- Robert Smithson ( Museum f¨r Gegenwartskunst Siegen - Reykjavik Art Museum, 2012.)
- About Carl Andre ( Riding House, London, 2006.)