@article{GDZPPN002350718, title = {Conformality and Pseudo-Riemannian Manifolds.}, journal = {Mathematica Scandinavica}, volume = {28}, year = {1971}, pages = {45-69}, zbl = {0221.31005}, url = {http://dml.mathdoc.fr/item/GDZPPN002350718} }
Lawrynowicz, J.; Waliszewski, W. Conformality and Pseudo-Riemannian Manifolds.. Mathematica Scandinavica, Tome 28 (1971) pp. 45-69. http://gdmltest.u-ga.fr/item/GDZPPN002350718/