New Grove, 2nd ed. WWW site, 12-10-01 (Kagel, Mauricio (Raúl); b. Buenos Aires, 24 Dec. 1931; German composer, film maker, and playwright of Argentine birth)
German Wikipedia WWW site, Sept. 18, 2008 (under Mauricio Kagel: Mauricio Raúl Kagel; b. Dec. 24, 1931, Buenos Aires; d. Sept. 18, 2008, Cologne; Argentine-German composer, conductor, librettist, and director)