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Translated from Matematicheskie Zametki, Vol. 53, No. 3, pp. 37–50, March, 1993.
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Ivanov, V.I. On Jackson's theorem in L2 for price systems. Math Notes 53, 268–278 (1993). https://doi.org/10.1007/BF01207713
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DOI: https://doi.org/10.1007/BF01207713