TY  - JOUR
AU  - A. B. Ugol'nikov
TI  - Depth and polynomial equivalence of formulas for closed classes of two-valued logic
JO  - Matematičeskie zametki
PY  - 1987
SP  - 603
EP  - 612
VL  - 42
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1987_42_4_a12/
LA  - ru
ID  - MZM_1987_42_4_a12
ER  -