@article{1178244743, author = {Gupta, D. P.}, title = {On order of sum of the series of ultraspherical functions}, journal = {Tohoku Math. J. (2)}, volume = {10}, number = {3}, year = {1958}, pages = { 42-48}, language = {en}, url = {http://dml.mathdoc.fr/item/1178244743} }
Gupta, D. P. On order of sum of the series of ultraspherical functions. Tohoku Math. J. (2), Tome 10 (1958) no. 3, pp. 42-48. http://gdmltest.u-ga.fr/item/1178244743/