found: Mozart, W.A. Six quintets for string quartet and viola, 1957.
found: Baker, 8th ed. (Trampler, Walter; b. 8-25-15, Munich; violist and pedagogue)
found: FirstSearch PerAbs, Feb. 26, 1998 (Walter Trampler; d. Sep. 27, 1997, age 82)
found: Grove music online, March 18, 2013 (Trampler, Walter; born August 25, 1915, Munich, died September 27, 1997, Port Joli, N.S.; emigrated to U.S. in 1939; American viola player of German birth; founded member of the New Music Quartet (1947-1956); also played with the Budapest, Juilliard, and Guarneri quartets and with the Beaux Arts Trio; member of the Chamber Music Society of Lincoln Center, 1969-1994)