Geodesic
The summability by logarithmic means of the ultra-spherical series.
Bollettino della Unione matematica italiana, Série 3, Tome 17 (1962) no. 3, pp. 255-262.

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

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Singhai, B. C. The summability by logarithmic means of the ultra-spherical  series.. Bollettino della Unione matematica italiana, Série 3, Tome 17 (1962) no. 3, pp. 255-262. http://geodesic.mathdoc.fr/item/BUMI_1962_3_17_3_a0/

[l] Gupta D. P. , On the Cesaro Summability of the ultraspherical Series (2), «Proc. of the National Institute of Sciences of India», Vol. 24, A, No 6, 1958. | MR | Zbl

[2] Hardy, G. H. , The summability of a Fourier series by logartihmic means, «Quarterly journal of Maths.», 1931, V. 2. | Jbk 57.0322.01 | Zbl

[3] Kogbetliantz, E. , Recherches sur la sommabilité des séries ultrasphériques des moyennes arithmétiques, «Jour. de Mathématiques», (1924), (9), 3, 107-187. | fulltext mini-dml | Jbk 50.0207.05

[4] Szego, G. , Orthogonal polynomials, (1939), «Amer. Math. Soc. Collo quium Publications».