TY - JOUR AU - M. A. Naimark TI - On commutative algebras of operators in the space $\Pi_k$ JO - Doklady Akademii Nauk PY - 1965 SP - 767 EP - 770 VL - 161 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1965_161_4_a7/ LA - ru ID - DAN_1965_161_4_a7 ER -