@article{MAN_1907__64_158315,
     author = {Johannes Mollerup},
     title = {Die {Definition} des {Mengenbegriffs}},
     journal = {Mathematische Annalen},
     pages = {231--238},
     year = {1907},
     volume = {64},
     zbl = {38.0095.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1907__64_158315/}
}