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The material in this paper is a portion of a Ph.D. thesis submitted to the University of Maryland. The author is grateful to Professor Nelson G. Markley for his many valuable suggestions.
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Freiman, R. Regular minimal sets over the circle and the ellis minimal set. Math. Systems Theory 6, 145–163 (1972). https://doi.org/10.1007/BF01706086
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DOI: https://doi.org/10.1007/BF01706086