%0 Journal Article
%A V. V. Nikulin
%T Local invariants of 4-dimensional pseudo-Riemannian manifolds with a~Lorentz metric
%J Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara
%D 1985
%P 87-130
%V 17
%I mathdoc
%U http://geodesic.mathdoc.fr/item/INTG_1985_17_a2/
%G ru
%F INTG_1985_17_a2