%0 Journal Article
%A Yu. M. Vazhenin
%T Algorithmic problems and hierarchies of first-order languages
%J Algebra i logika
%D 1987
%P 419-434
%V 26
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1987_26_4_a1/
%G ru
%F AL_1987_26_4_a1