Nm 62 op. 109 / 1961 Fort
Forte, Allen: The compositional matrix / Allen Forte. – Baldwin, NY : Music Teachers National Association, 1961. – 95 S. : Faks. (Noten-Skizze), zahlr. Notenbeisp. – (Monographs in theory and composition ; 1)
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P / 1977 Nine
Marston, Nicholas: Schenker and Forte reconsidered: Beethoven's sketches for the piano sonata in E, op. 109 / Nicholas Marston. – 1986. – Notenbeisp.
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