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Translated from Matematicheskie Zametki, Vol. 33, No. 5, pp. 689–700, May, 1983.
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Malyugin, A.A. Sharp estimates of norms in C of orthogonal projection onto subspaces of polygons. Mathematical Notes of the Academy of Sciences of the USSR 33, 355–361 (1983). https://doi.org/10.1007/BF01158282
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DOI: https://doi.org/10.1007/BF01158282