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40D15 Convergence factors and summability factors (2 articles)

• Krasniqi, Xhevat Z.: On $|A, \delta |_{k}$-summability of orthogonal series. (English). Mathematica Bohemica, vol. 137 (2012), issue 1, pp. 17-25
• Bor, Hüseyin: On absolute summability factors for $|\overline{N}, p_n|_k$ summability. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 32 (1991), issue 3, pp. 435-439