@article{MAN_1915__76_158703,
     author = {L. L\"owenheim},
     title = {\"Uber {M\"oglichkeiten} im {Relativkalk\"ul}},
     journal = {Mathematische Annalen},
     pages = {447--470},
     publisher = {mathdoc},
     volume = {76},
     year = {1915},
     zbl = {45.0108.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1915__76_158703/}
}