@article{1077489653, author = {Astrachan, Max}, title = {Studies in the summability of Fourier series by N\"orlund means}, journal = {Duke Math. J.}, volume = {2}, number = {1}, year = {1936}, pages = { 543-568}, language = {en}, url = {http://dml.mathdoc.fr/item/1077489653} }
Astrachan, Max. Studies in the summability of Fourier series by Nörlund means. Duke Math. J., Tome 2 (1936) no. 1, pp. 543-568. http://gdmltest.u-ga.fr/item/1077489653/