MathSciNet bibliographic data MR540326 41A55 Levin, M. I. On approximation in \$L\sb{2}\$$L\sb{2}$ and optimal cubature formulae. Fourier analysis and approximation theory (Proc. Colloq., Budapest, 1976), Vol. II, pp. 495–501, Colloq. Math. Soc. János Bolyai, 19, North-Holland, Amsterdam-New York, 1978. Links to the journal or article are not yet available

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