Literature Cited
A. D. Aleksandrov, “Mappings of families of sets,” Dokl. Akad. Nauk SSSR,190, No. 3, 502–505 (1970).
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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 19, No. 1, pp. 186–192, January–February, 1978.
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Fedotov, V.P. Some remarks on discrete chronogeometry. Sib Math J 19, 132–136 (1978). https://doi.org/10.1007/BF00967374
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DOI: https://doi.org/10.1007/BF00967374