TY  - JOUR
AU  - V. P. Orevkov
TI  - Unsolvability in constructive predicate calculus of a class of formulas of type $\daleth\daleth\forall\exists$
JO  - Doklady Akademii Nauk
PY  - 1965
SP  - 581
EP  - 583
VL  - 163
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1965_163_3_a10/
LA  - ru
ID  - DAN_1965_163_3_a10
ER  -