%0 Journal Article
%A Raina Ivanova
%T An Orthogonal Tangential Group of Transformations of a 4-Dimensional Riemannian Manifold
%J Mathematica balkanica
%D 1997
%P 57
%V 11
%N 1-2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MABA_1997_11_1-2_a6/
%F MABA_1997_11_1-2_a6