@article{GDZPPN002105292, title = {Isometry groups of Lorentz manifolds.}, journal = {Inventiones mathematicae}, volume = {93}, year = {1988}, pages = {555-566}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN002105292} }
D'Ambra, G. Isometry groups of Lorentz manifolds.. Inventiones mathematicae, Tome 93 (1988) pp. 555-566. http://gdmltest.u-ga.fr/item/GDZPPN002105292/