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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 38, No. 1, pp. 111–114, January–February, 1986.
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Kulik, A.N. Approximations of continuous periodic functions that are differentiate along the trajectories of dynamical systems. Ukr Math J 38, 100–103 (1986). https://doi.org/10.1007/BF01056770
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DOI: https://doi.org/10.1007/BF01056770