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Additional information
Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 27, No. 1, pp. 79–85, January–February, 1986.
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Kuz'minykh, A.V. Maps that preserve the unit distance in only finitely many directions. Sib Math J 27, 62–67 (1986). https://doi.org/10.1007/BF00969343
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DOI: https://doi.org/10.1007/BF00969343