↑ Johan August Wallensteen (5 March 1923). "Obituary". Svenska Dagbladet (in Swedish). pp.2–7.
↑ John Bergsagel (2001). "Hamerik: (1) Asger Hamerik [Hammerich]". In Stanley Sadie; John Tyrrell (eds.). The New Grove Dictionary of Music and Musicians. Macmillan Publishers.
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