TY  - JOUR
AU  - M. F. Raţă
TI  - A formal reduction of the general problem of the expressibility of formulas in the G\"odel-L\"ob provability logic
JO  - Diskretnaya Matematika
PY  - 2002
SP  - 95
EP  - 106
VL  - 14
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DM_2002_14_2_a8/
LA  - ru
ID  - DM_2002_14_2_a8
ER  -