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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 15, No. 4, pp. 892–908, July–August, 1974.
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Osilenker, B.P. Convergence and summability of fourier expansions in orthonormal polynomials associated with difference operators of second order. Sib Math J 15, 632–643 (1974). https://doi.org/10.1007/BF00967439
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DOI: https://doi.org/10.1007/BF00967439