TY  - JOUR
AU  - A. I. Stukachev
TI  - $\Sigma$-Definability in Hereditarily Finite Superstructures and Pairs of Models
JO  - Algebra i logika
PY  - 2004
SP  - 459
EP  - 481
VL  - 43
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_2004_43_4_a4/
LA  - ru
ID  - AL_2004_43_4_a4
ER  -