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@article{MAN_1922__85_158926, author = {Kasner.E.}, title = {The solar gravitational field completely determined by its light rays}, journal = {Mathematische Annalen}, pages = {227--236}, publisher = {mathdoc}, volume = {85}, year = {1922}, zbl = {48.1039.05}, url = {http://geodesic.mathdoc.fr/item/MAN_1922__85_158926/} }
Kasner.E. The solar gravitational field completely determined by its light rays. Mathematische Annalen, Tome 85 (1922), pp. 227-236. http://geodesic.mathdoc.fr/item/MAN_1922__85_158926/