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Additional information
Moscow Institute of Technology. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 24, No. 3, pp. 92–101, May–June, 1983.
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Kotanov, S.S. Extension of fundamental mappings. Sib Math J 24, 391–398 (1983). https://doi.org/10.1007/BF00971550
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DOI: https://doi.org/10.1007/BF00971550