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Research supported by the National Science Foundation, Grant GP-1816.
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Blum, J.R., Friedman, N. On roots of transformations. Z. Wahrscheinlichkeitstheorie verw Gebiete 5, 1–5 (1966). https://doi.org/10.1007/BF00532809
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DOI: https://doi.org/10.1007/BF00532809