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@article{MAN_1925__94_159101, author = {H.W. Brinkmann}, title = {Einstein spaces which are mapped conformally on each other}, journal = {Mathematische Annalen}, pages = {119--145}, publisher = {mathdoc}, volume = {94}, year = {1925}, zbl = {51.0568.03}, url = {http://geodesic.mathdoc.fr/item/MAN_1925__94_159101/} }
H.W. Brinkmann. Einstein spaces which are mapped conformally on each other. Mathematische Annalen, Tome 94 (1925), pp. 119-145. http://geodesic.mathdoc.fr/item/MAN_1925__94_159101/