@article{MAN_1964__156_161215,
     author = {H. FREUDENTHAL},
     title = {Das {Helmholtz-Liesche} {Raumproblem} bei indefiniter {Metrik.}},
     journal = {Mathematische Annalen},
     pages = {265--312},
     year = {1964},
     volume = {156},
     zbl = {0173.50302},
     url = {http://geodesic.mathdoc.fr/item/MAN_1964__156_161215/}
}