dbp:reference
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- Griffiths, Paul. 1974. "String Quartet by Crawford Seeger; The Composers Quartet; String Quartet No. 5 by Perle; The Composers Quartet; String Quartet No. 2 by Babbitt; The Composers Quartet". The Musical Times 115, no. 1573 : 222. (en)
- Straus, Joseph N. 1986. "Listening to Babbitt". Perspectives of New Music 24, no. 2 : 10–24. (en)
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