Heinzelmann, Sigrun B. "The Problems of Prolongation in... Ravel", 2006, Box: 1, Folder: 8. International Schenker Symposium records, MA-03-02-01. The New School Archives.
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Heinzelmann, Sigrun B. "The Problems of Prolongation in... Ravel", 2006, Box: 1, Folder: 8. International Schenker Symposium records, MA-03-02-01. The New School Archives. https://findingaids.archives.newschool.edu/repositories/3/archival_objects/55818 Accessed May 20, 2026.