@article{GDZPPN002347288,
title = {Mean Summability for Ultraspherical Polynomials.},
journal = {Mathematica Scandinavica},
volume = {13},
year = {1963},
pages = {167-177},
zbl = {0132.29501},
url = {http://dml.mathdoc.fr/item/GDZPPN002347288}
}
Askey, Richard; Hirschman, I.I. Jr. Mean Summability for Ultraspherical Polynomials.. Mathematica Scandinavica, Tome 13 (1963) pp. 167-177. http://gdmltest.u-ga.fr/item/GDZPPN002347288/