@article{MZ_1922__15_167718,
     author = {K. Knopp},
     title = {\"Uber das {Eulersche} {Summierungsverfahren}},
     journal = {Mathematische Zeitschrift},
     pages = {226--253},
     publisher = {mathdoc},
     volume = {15},
     year = {1922},
     zbl = {48.0232.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1922__15_167718/}
}