@article{MZ_1942__48_168998,
     author = {N. Obreschkoff},
     title = {\"Uber das {Riemannsche} {Summierungsverfahren}},
     journal = {Mathematische Zeitschrift},
     pages = {441--454},
     publisher = {mathdoc},
     volume = {48},
     year = {1942},
     zbl = {68.0138.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1942__48_168998/}
}