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@article{AM2_1982__25_136965, author = {J.A. Lester}, title = {Transformations of {Robertson-Walker} spacetimes preserving separation zero.}, journal = {Aequationes mathematicae}, pages = {216--232}, publisher = {mathdoc}, volume = {25}, year = {1982}, zbl = {0538.53062}, url = {http://geodesic.mathdoc.fr/item/AM2_1982__25_136965/} }
J.A. Lester. Transformations of Robertson-Walker spacetimes preserving separation zero.. Aequationes mathematicae, Tome 25 (1982), pp. 216-232. http://geodesic.mathdoc.fr/item/AM2_1982__25_136965/