TY  - JOUR
AU  - E. Yu. Nogina
TI  - Classes of arithmetic companions of modal provability logics
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 1990
SP  - 31
EP  - 33
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_1990_1_a6/
LA  - ru
ID  - VMUMM_1990_1_a6
ER  -