%0 Journal Article
%A E. I. Timoshenko
%T The preservation of elementary and universal equivalence in the
%J Algebra i logika
%D 1968
%P 114-119
%V 7
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1968_7_4_a6/
%G ru
%F AL_1968_7_4_a6