%0 Journal Article
%A P. I. Petrov
%T On differential invariants of conformally flat three-dimensional Riemannian spaces
%J Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki
%D 1954
%P 109-122
%V 114
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/UZKU_1954_114_2_a6/
%G ru
%F UZKU_1954_114_2_a6