TY - JOUR AU - V. É. Shpil'rain TI - Subgroups induced by ideals of the free group ring JO - Vestnik Moskovskogo universiteta. Matematika, mehanika PY - 1989 SP - 60 EP - 63 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/VMUMM_1989_6_a15/ LA - ru ID - VMUMM_1989_6_a15 ER -