TY - JOUR AU - M. F. Raţă AU - A. G. Russu TI - On some properties of systems, complete with respect to expressibility, of formulas in the G\"odel--L\"ob provability logic JO - Diskretnaya Matematika PY - 2000 SP - 63 EP - 82 VL - 12 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DM_2000_12_4_a5/ LA - ru ID - DM_2000_12_4_a5 ER -