TY  - JOUR
AU  - O. V. Kudinov
TI  - Compressed systems of finite approximations for sets in the class $\Sigma_2^0$
JO  - Matematičeskie trudy
PY  - 1996
SP  - 111
EP  - 113
VL  - 30
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MT_1996_30_a5/
LA  - ru
ID  - MT_1996_30_a5
ER  -