Article, 1961, Roland F. Pease Jr. Testimonial of Roland F. Pease Jr. on the blue monochromes seen at the Leo Castelli exhibition, 1961
Photo, 1949 Christmas evening at Hans Hartung's with Yves Klein standing on the right, surrounded by Colette and Pierre Soulages
Photo, 1961 Pierre Restany during the exhibition "Yves Klein the Monochrome: il nuovo realismo del colore", Galleria Apollinaire