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Akademie der Künste [2011-12-24]
Sonido 13 [2015-02-20]
Known as Doreen Carwithen or Mary Alwyn
William Alwyn Archive, University of Cambridge Library
Quartets with numbers not appearing in this list, as well as many others, are for four violins.
Communication from Catherine Catoire, 2010-08-14 et seq.
Czech Music Information Centre [2015-07-06]