%0 Journal Article
%A I. V. Petrova
%T Some aspects of the theory of $L_2$-approximations on a hyperboloid in $R^{n,1}$
%J Doklady Akademii Nauk
%D 1990
%P 298-304
%V 310
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1990_310_2_a9/
%G ru
%F DAN_1990_310_2_a9