The catalogue for the exhibition Zero, Pop and Minimal – The 1960s and 1970s held in 2022 at the Von der Heydt-Museum in Wuppertal, Germany, has been published.
https://shop.von-der-heydt-museum.de/de/product/46221
https://en.von-der-heydt-museum.de/exhibitions/fokus-von-der-heydt/