
Quote of Appel in an interview with fr:Michel Ragon, 1963; as quoted in; Karel Appel, a gesture of colour, Jean-François Lyotard, (original French text of 1992 based upon intensive correspondence with Karel Appel), Christine Buci-Glucksmann, Herman Parret; University Press, Leuven, Belgium, 2009, p. 105
fr:Michel Ragon asked Appel: 'Without Cobra, would you have been what you are today?'