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2. Brown, Stephen C.1999. "Dual Interval Space in Twentieth-Century Music."Ph.D. dissertation, Yale University.
3. Buchler, Michael Howard.1997. "Relative Saturation of Subsets and Interval Cycles as a Means for Determining Set-Class Similarity."Ph.D. dissertation, University of Rochester.
4. Castren, Marcus.1994. RECREL: A Similarity Measure for Set-Classes. Helsinki: Sibelius Academy.