@article{1178245641,
author = {Matsuyama, Noboru},
title = {Notes on Fourier analysis (XXXVII): On the convergence factor of the Fourier series at a point},
journal = {Tohoku Math. J. (2)},
volume = {2},
number = {2},
year = {1950},
pages = { 126-134},
language = {en},
url = {http://dml.mathdoc.fr/item/1178245641}
}
Matsuyama, Noboru. Notes on Fourier analysis (XXXVII): On the convergence factor of the Fourier series at a point. Tohoku Math. J. (2), Tome 2 (1950) no. 2, pp. 126-134. http://gdmltest.u-ga.fr/item/1178245641/