@article{INTA_1968_5_a5,
     author = {G. I. Kruchkovich},
     title = {Riemannian and {pseudo-Riemannian} spaces},
     journal = {Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya},
     pages = {191--220},
     year = {1968},
     volume = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTA_1968_5_a5/}
}