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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 24, No. 6, pp. 66–79, November–December, 1983.
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Kaplan, L.I. Points of continuity of a function and points of existence of finite and infinite derivative. Sib Math J 24, 876–889 (1983). https://doi.org/10.1007/BF00970313
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DOI: https://doi.org/10.1007/BF00970313