@article{MOMA_1955__59_176959,
     author = {K. Prachar},
     title = {\"Uber die {Summe} ... .},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {43--44},
     year = {1955},
     volume = {59},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1955__59_176959/}
}