Further biographical information in following Encyclopaedia:

• H. Riemann- Musiklexikon (Supplement to    persons section), B. Schott's Söhne, Mainz 1975
• M. Honegger/G. Massenkeil: Das Große Lexikon
   der Musik, Herder, Freiburg 1982
• International Who is Who in Music, Cambridge
   1975
• Who is Who in Austria 1997
• Brockhaus Riemann Musiklexikon 1979/1998
• Brockhaus Enzyklopädie 1986/1992
The New Grove Dictionary of Music and    Musicians,    2nd Edition, London 2001
• EU - Who is Who, 1st Edition 2003
• Austrian Honorary Cross for Science and Art,
   First Class 2003

Kürschners Deutscher Musik-Kalender, Edition
   2004

MGG - Die Musik in Geschichte und Gegenwart,
   2nd edition, Bärenreiter and Metzler 2005