@article{MAN_1923__90_159012,
     author = {N. Koschliakoff},
     title = {\"Uber eine {Summenformel}},
     journal = {Mathematische Annalen},
     pages = {26--29},
     publisher = {mathdoc},
     volume = {90},
     year = {1923},
     zbl = {49.0210.05},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__90_159012/}
}