@article{MAN_1922__87_158965,
     author = {H. Beck},
     title = {\"Uber uneigentliche {Somen}},
     journal = {Mathematische Annalen},
     pages = {152--155},
     year = {1922},
     volume = {87},
     zbl = {48.0637.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1922__87_158965/}
}