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- Decroupet, Pascal. 2001. "Pousseur, Henri". The New Grove Dictionary of Music and Musicians, 2nd edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan. (en)
- Mann, William. 1969b. "Music in London: Birthday Concerts" [Alfred Kalmus]. The Musical Times 110, no. 1516, 125th anniversary issue : 645. (en)
- Frisius, Rudolf. 2008. Karlheinz Stockhausen II: Die Werke 1950–1977; Gespräch mit Karlheinz Stockhausen, "Es geht aufwärts". Mainz, London, Berlin, Madrid, New York, Paris, Prague, Tokyo, Toronto: Schott Musik International. . (en)
- Mann, William. 1969a. "A Garland for Dr Kalmus". The Times, issue 57542 : 16, col D. (en)
- Hopkins, G. W., and Paul Griffiths. 2001. "Boulez, Pierre". The New Grove Dictionary of Music and Musicians, 2nd edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan. (en)
- Maconie, Robin. 2005. Other Planets: The Music of Karlheinz Stockhausen. Lanham, Maryland, Toronto, Oxford: Scarecrow Press. . (en)
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