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This paper was prepared partly under the sponsorship of the United States Air Force, Offfce of Scientific Research, ARDC, under a contract with the University of Pennsylvania.
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Mairhuber, J.C., Schoenberg, I.J. & Williamson, R.E. On variation diminishing transformations on the circle. Rend. Circ. Mat. Palermo 8, 241–270 (1959). https://doi.org/10.1007/BF02843691
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DOI: https://doi.org/10.1007/BF02843691