%0 Journal Article
%A V. A. Yankov
%T Finite validity of formulas of special form
%J Doklady Akademii Nauk
%D 1967
%P 302-304
%V 174
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_174_2_a11/
%G ru
%F DAN_1967_174_2_a11