TY  - JOUR
AU  - V. P. Orevkov
TI  - Undecidable classes of formulas for the constructive predicate calculus.~I
JO  - Informatics and Automation
PY  - 1972
SP  - 100
EP  - 108
VL  - 121
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1972_121_a5/
LA  - ru
ID  - TRSPY_1972_121_a5
ER  -