Merrett, J. Death and the maiden, p2005.
Snowman, D. The Amadeus Quartet, 1981: t.p. (Amadeus Quartet) p. 33 (facsim. of concert poster, July 13, 1947: Brainin String Quartet) p. 35 (renamed Amadeus because Norbert Brainin was not well known, and non-personal names for string quartets were in fashion) p. 36 (facsim. of poster for first concert as Amadeus Quartet, Jan. 10, 1948: Amadeus String Quartet) p. 52 (Strunen kvartet “Amadeus”) p. 102 (Quartetto Amadeus)
New Grove: (Amadeus Quartet; English string quartet, founded 1947)
Jacobs, A. Penguin dict. of musical performers, 1991: (Amadeus Quartet; British string quartet; founded 1947, disbanded 1987)