@article{INTA_1968_a6,
     author = {A. Z. Petrov},
     title = {Geometry and physical space-time},
     journal = {Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya },
     pages = {221--265},
     publisher = {mathdoc},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTA_1968_a6/}
}