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The preparation of this paper was sponsored in part by the Office of Naval Research, U. S. Navy. Reproduction in whole or in part is permitted for any purpose of the United States Government.
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Hartman, P. On isometries and on a theorem of Liouville. Math Z 69, 202–210 (1958). https://doi.org/10.1007/BF01187401
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DOI: https://doi.org/10.1007/BF01187401