@article{ELMA_1949__4_140508,
     author = {H. Kreis},
     title = {\"Uber die {Potenzsummen} der nat\"urlichen {Zahlen.}},
     journal = {Elemente der Mathematik},
     pages = {54--56},
     publisher = {mathdoc},
     volume = {4},
     year = {1949},
     zbl = {0033.00704},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1949__4_140508/}
}