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Translated from Matematicheskie Zametki, Vol. 42, No. 1, pp. 94–100, July, 1987.
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Basmanov, V.N., Savchenko, A.G. Hilbert space as the space of retractions of an interval. Mathematical Notes of the Academy of Sciences of the USSR 42, 563–566 (1987). https://doi.org/10.1007/BF01138727
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DOI: https://doi.org/10.1007/BF01138727