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  2. Michael Clausen, Beiträge zum Entwurf schneller Spektraltransformationen, PhD Thesis, Universität Karlsruhe, 1998.
  3. Meinard Müller and Michael Clausen, DFT-based word normalization in finite supersolvable groups, Appl. Algebra Engrg. Comm. Comput. 15 (2004), no. 3-4, 213–231.[MR/doi]