@article{MZ_1926__25_167880,
     author = {A. Zygmund},
     title = {Sur un th\'eor\`eme de la th\'eorie de la sommabilit\'e},
     journal = {Mathematische Zeitschrift},
     pages = {291--296},
     publisher = {mathdoc},
     volume = {25},
     year = {1926},
     zbl = {52.0217.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1926__25_167880/}
}