@article{MOMA_1957__61_177012,
     author = {Josef Weier},
     title = {\"Uber einen {Erweiterungssatz.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {51--53},
     publisher = {mathdoc},
     volume = {61},
     year = {1957},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1957__61_177012/}
}