@article{AM2_1984__27_137009,
     author = {Jan Peleska},
     title = {A characterization for isometries and conformal mappings of {pseudo-Riemannian} manifolds.},
     journal = {Aequationes mathematicae},
     pages = {20--31},
     publisher = {mathdoc},
     volume = {27},
     year = {1984},
     zbl = {0539.53017},
     url = {http://geodesic.mathdoc.fr/item/AM2_1984__27_137009/}
}