@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/}
}