Geodesic
De la Vallé Poussin means of Fourier–Gegenbauer series
Matematičeskie zametki, Tome 7 (1970) no. 1, pp. 19-30 
S. O. Kallaev. De la Vallé Poussin means of Fourier–Gegenbauer series. Matematičeskie zametki, Tome 7 (1970) no. 1, pp. 19-30. http://geodesic.mathdoc.fr/item/MZM_1970_7_1_a2/
@article{MZM_1970_7_1_a2,
     author = {S. O. Kallaev},
     title = {De la {Vall\'e} {Poussin} means of {Fourier{\textendash}Gegenbauer} series},
     journal = {Matemati\v{c}eskie zametki},
     pages = {19--30},
     year = {1970},
     volume = {7},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_1_a2/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A bound is given for the order of growth of de la Vallé Poussin means of a Fourier–Gegenbauer series.