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Additional information
Kemerovo. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 31, No. 1, pp. 14–26, January–February, 1990.
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Astrakov, S.N. Maps of pseudo-Euclidean spaces preserving isotropicity of vectors. Sib Math J 31, 10–20 (1990). https://doi.org/10.1007/BF00971144
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DOI: https://doi.org/10.1007/BF00971144