Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1970_7_1_a2, author = {S. O. Kallaev}, title = {De la {Vall\'e} {Poussin} means of {Fourier--Gegenbauer} series}, journal = {Matemati\v{c}eskie zametki}, pages = {19--30}, publisher = {mathdoc}, volume = {7}, number = {1}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_1_a2/} }
S. O. Kallaev. De la Vall\'e 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/