found: Stoltzman, R. Aria, p1997:container (Kalmen Opperman; conductor)
found: LC in OCLC, Jan. 19, 1998(hdg.: Opperman, Kalmen)
found: Modern daily studies for the clarinet ... c1952-1962:t.p. (Kalmen Opperman)
found: Rischin, R. One of a kind [SR] p2009:container (Kalmen Opperman; b. 1919) insert (American clarinetist, teacher, conductor, composer, mouthpiece and barrel maker, and writer of numerous clarinet studies)
found: New York times WWW site, June 23, 2010(in obituary published June 22: Kalmen Opperman; b. Dec. 8, 1919, Lower East Side of Manhattan; d. Friday [June 18, 2010], Manhattan, aged 90; master clarinetist whose intensive teaching methods helped mold some of the top players of the last 50 years)
found: wikipedia on line Dec 16, 2010(Kalmen Opperman; b. Dec. 8, 1919; d. June 18, 2010; American clarinetist)