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Translated from Matematicheskie Zametki, Vol. 53, No. 5, pp. 158–160, May, 1993.
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Kryakin, Y.V. The Whitney constants are bounded by two. Math Notes 53, 560–562 (1993). https://doi.org/10.1007/BF01208555
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DOI: https://doi.org/10.1007/BF01208555