%0 Journal Article
%A A. I. Stukachev
%T $\Sigma$-Definability in Hereditarily Finite Superstructures and Pairs of Models
%J Algebra i logika
%D 2004
%P 459-481
%V 43
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_2004_43_4_a4/
%G ru
%F AL_2004_43_4_a4