@article{MAN_1957__134_160571,
     author = {G. Ewald},
     title = {\"Uber eine {Ber\"uhreigenschaft} von {Kreisen.}},
     journal = {Mathematische Annalen},
     pages = {58--61},
     publisher = {mathdoc},
     volume = {134},
     year = {1957},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1957__134_160571/}
}