%0 Journal Article
%A V. N. Berestovskiǐ
%A I. A. Zubareva
%T Functions with (non)timelike gradient on a~space-time
%J Matematičeskie trudy
%D 2014
%P 41-60
%V 17
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MT_2014_17_2_a2/
%G ru
%F MT_2014_17_2_a2