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Additional information
Kharkov State University. Translated from Matematicheskie Zametki, Vol. 56, No. 5, pp. 87–97, November, 1994.
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Nikolaevskii, Y.A. On Fenchel's problem. Math Notes 56, 1158–1164 (1994). https://doi.org/10.1007/BF02274663
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DOI: https://doi.org/10.1007/BF02274663