TY  - JOUR
AU  - P. G. Naumov
TI  - Undecidability of a second-order provability logic with witness comparison
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 1993
SP  - 14
EP  - 17
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_1993_3_a2/
LA  - ru
ID  - VMUMM_1993_3_a2
ER  -