@article{MZ_1985__189_173588,
     author = {Bernhard Ruh},
     title = {Kr\"ummungstreue {Diffeomorphismen} {Riemannscher} und {pseudo-Riemannscher} {Mannigfaltigkeiten.}},
     journal = {Mathematische Zeitschrift},
     pages = {371--392},
     publisher = {mathdoc},
     volume = {189},
     year = {1985},
     zbl = {0557.53010},
     url = {http://geodesic.mathdoc.fr/item/MZ_1985__189_173588/}
}