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- Kurtz, Michael. 1992. Stockhausen: A Biography. Translated by Richard Toop. London: Faber and Faber. . (en)
- Stockhausen, Karlheinz. 1989. Stockhausen on Music: Lectures and Interviews. Edited by Robin Maconie. London and New York: Marion Boyars. . (en)
- Neuhaus, Max. 2004. Liner notes to Four Realizations of Stockhausen’s Zyklus. Alga Marghen CD ALGA 054CD. (en)
- Wolf-Eberhard von Lewinski. 1959. "Klausur, Studio und Forum in Kranichstein." 28:302. (en)
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