Article, 1961, Roland F. Pease Jr. Testimonial of Roland F. Pease Jr. on the blue monochromes seen at the Leo Castelli exhibition, 1961
Photo, janvier 1961 Yves Klein next to a Sponge Relief (RE 10) lors de son exposition "Yves Klein Monochrome und Feuer", Museum Haus Lange
Photo, 1961 "Fire Fountain" during the exhibition "Yves Klein Monochrome und Feuer" at the Museum Haus Lange