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Quartet score IMI 115
Quartet No. 15 may be the Pollicino Quartet, Op. 550, of 1990, for violin, viola, cello, and string bass, or the Jacques Chirac piece listed here.
Sekretariat for Ny Kompositionsmusik [2011-12-25]
Nicolai Berezowsky scores, Music Division, New York Public Library [2014-05-17]
Stephan 1998, 2007
Born in the Grand Duchy of Finland
Information is needed on the length of his stay in Switzerland in the mid-1950s.