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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 12, No. 6, pp. 1273–1282, November–December, 1971.
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Daugavet, I.K. A property of polynomial operators and applications to series in orthogonal polynomials and projection methods. Sib Math J 12, 917–923 (1971). https://doi.org/10.1007/BF00966534
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DOI: https://doi.org/10.1007/BF00966534