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@article{MS2_1971__28_166164, author = {J. Lawrynowicz and W. Waliszewski}, title = {Conformality and {Pseudo-Riemannian} {Manifolds.}}, journal = {Mathematica Scandinavica}, pages = {45--69}, publisher = {mathdoc}, volume = {28}, year = {1971}, zbl = {0221.31005}, url = {http://geodesic.mathdoc.fr/item/MS2_1971__28_166164/} }
J. Lawrynowicz; W. Waliszewski. Conformality and Pseudo-Riemannian Manifolds.. Mathematica Scandinavica, Tome 28 (1971), pp. 45-69. http://geodesic.mathdoc.fr/item/MS2_1971__28_166164/