Paul Doktor, Viola Entered from booking ledger and New York Times concert listing and review. WORLD PREMIERE of Alvin Etler's SONATA FOR VIOLA AND HARPSICHORD WORLD PREMIERE of Bernard Krol's LASSUS VARIATIONS "Opera and Concert Programs." New York Times (1923-), Jan 17 1965, p. 1. ProQuest. Web. 13 Feb. 2024. "DOKTOR PERFORMS 2D VIOLA CONCERT: JOINED BY BLANCHE WINOGRON ON THE HARPSICHORD." New York Times (1923-), Jan 18 1965, p. 18. ProQuest. Web. 13 Feb. 2024. solo recital 1965-01-17T20:30:00