TY  - JOUR
AU  - A. D. Korshunov
TI  - On the power and structure of some closed Post classes (families
JO  - Doklady Akademii Nauk
PY  - 1987
SP  - 533
EP  - 537
VL  - 295
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1987_295_3_a3/
LA  - ru
ID  - DAN_1987_295_3_a3
ER  -