TY - JOUR AU - L. M. Kogan-Bernstein TI - Simplification of Gentzen's reductions in the classical arithmetic JO - Zapiski Nauchnykh Seminarov POMI PY - 1981 SP - 45 EP - 52 VL - 105 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ZNSL_1981_105_a5/ LA - ru ID - ZNSL_1981_105_a5 ER -