TY - JOUR AU - O. S. Ivan'kovskaya TI - The powers of certain matrix operators applied to the bounded elements of a~ring JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1970 SP - 40 EP - 42 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1970_5_a4/ LA - ru ID - IVM_1970_5_a4 ER -