found: Saint-Saëns, C. Le carnaval des animaux. [Phonodisc] 1967.
found: Dictionnaire des interprètes et de l'interprétation musicale au XXe siècle, c1982 (Weissenberg, Alexis; b. 7-29-1929, Sofia; Bulgarian pianist, naturalized French)
found: Baker's biographical dictionary of twentieth-century classical musicians, c1997 (Weissenberg, Alexis (Sigismond); b. July 26, 1929, Sofia; Bulgarian-born French pianist)
found: Weissenberg, A. Piano music of Prokofiev and Scriabin [SR] 1948?: labels (Sigi Weissenberg, piano) program notes (b. Bulgaria)
found: French Wikipedia WWW site, Jan. 9, 2012 (Alexis Weissenberg; b. July 26, 1929, Sofia; d. Jan. 8, 2012, Lugano; French pianist of Bulgarian origin)