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Part of this paper work was done while the author was a guest at the Mathematisches Forschungsinstitut ETH Zürich in September 1974
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Simon, U. Isometries with spheres. Math Z 153, 23–27 (1977). https://doi.org/10.1007/BF01214730
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DOI: https://doi.org/10.1007/BF01214730