Andrienko, Vitalii A. To the question on the almost everywhere convergence of the Riesz means of double orthogonal series. (English) Zbl 1256.42043 J. Math. Sci., New York 183, No. 6, 749-761 (2012); translation from Ukr. Mat. Visn. 9, No. 1, 1-17 (2012). MSC: 42C15 × Cite Format Result Cite Review PDF Full Text: DOI
Andrienko, V. A. Rate of approximation of orthogonal series by Riesz means. (English. Russian original) Zbl 0731.42029 Math. Notes 48, No. 5, 1077-1085 (1990); translation from Mat. Zametki 48, No. 5, 3-14 (1990). Reviewer: K.Tandori MSC: 42C15 40G99 × Cite Format Result Cite Review PDF Full Text: DOI
Ziza, O. A. Summation of orthogonal series by the methods (phi,lambda). (English) Zbl 0473.42021 Math. Notes 25, 91-102 (1979). MSC: 42C15 40C05 × Cite Format Result Cite Review PDF Full Text: DOI