@article{MZ_1930__31_168182,
     author = {I. Schur},
     title = {Zur {Theorie} der {Ces\`aroschen} und {H\"olderschen} {Mittelwerte}},
     journal = {Mathematische Zeitschrift},
     pages = {391--407},
     publisher = {mathdoc},
     volume = {31},
     year = {1930},
     zbl = {55.0125.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1930__31_168182/}
}