@article{MAN_1890__37_157530,
     author = {Klein},
     title = {Zur {:Nicht-Euklischen} {Geometrie}},
     journal = {Mathematische Annalen},
     pages = {544--572},
     publisher = {mathdoc},
     volume = {37},
     year = {1890},
     url = {http://geodesic.mathdoc.fr/item/MAN_1890__37_157530/}
}