TY  - JOUR
AU  - S. V. Solov'ev
TI  - Preservation of the equivalence of proofs under reduction of the formula depth
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 1979
SP  - 197
EP  - 208
VL  - 88
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_1979_88_a15/
LA  - ru
ID  - ZNSL_1979_88_a15
ER  -