@article{MAN_1874__7_156655,
     author = {Klein},
     title = {Nachtrag zu dem ?zweiten {Aufsatze} \"uber {Nicht-Euklidische} {Geometrie}},
     journal = {Mathematische Annalen},
     pages = {531--537},
     publisher = {mathdoc},
     volume = {7},
     year = {1874},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1874__7_156655/}
}