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Dedicated to Bjarni Jönsson on the occasion of his 70th birthday
The author would like to express his deepest thanks to Prof. J. B. Nation for many consultations on the material in this manuscript.
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Day, A. Congruence normality: The characterization of the doubling class of convex sets. Algebra Universalis 31, 397–406 (1994). https://doi.org/10.1007/BF01221793
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DOI: https://doi.org/10.1007/BF01221793