%0 Journal Article
%A L. B. Grigoryeva
%T Chronometrically invariant representation of the classification of Petrov's gravitational fields
%J Doklady Akademii Nauk
%D 1970
%P 1251-1254
%V 192
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_192_6_a15/
%G ru
%F DAN_1970_192_6_a15