@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/}
}