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