Geodesic
Local invariants of 4-dimensional pseudo-Riemannian manifolds with a Lorentz metric
Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Itogi Nauki i Tekhniki. Seriya "Problemy Geometrii", Tome 17 (1985), pp. 87-130 
V. V. Nikulin. Local invariants of 4-dimensional pseudo-Riemannian manifolds with a Lorentz metric. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Itogi Nauki i Tekhniki. Seriya "Problemy Geometrii", Tome 17 (1985), pp. 87-130. http://geodesic.mathdoc.fr/item/INTG_1985_17_a2/
@article{INTG_1985_17_a2,
     author = {V. V. Nikulin},
     title = {Local invariants of 4-dimensional {pseudo-Riemannian} manifolds with {a~Lorentz} metric},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {87--130},
     year = {1985},
     volume = {17},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1985_17_a2/}
}
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%P 87-130
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