@article{JRAM_1911__140_149365,
     author = {Demetrius Grav\'e},
     title = {D\'emonstration d'un th\'eor\`eme de {Tch\'ebychef} g\'en\'eralis\'e.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {247--251},
     publisher = {mathdoc},
     volume = {140},
     year = {1911},
     zbl = {42.0712.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1911__140_149365/}
}