TY - JOUR AU - R. È. Yavorskii TI - On Prenex Fragment of Provability Logic with Quantifiers on Proofs JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 2003 SP - 123 EP - 135 VL - 242 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM_2003_242_a9/ LA - ru ID - TM_2003_242_a9 ER -