TY - JOUR AU - L. A. Sakhnovich TI - Operators which are similar to unitary operators with absolutely continuous spectrum JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 1968 SP - 51 EP - 63 VL - 2 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_1968_2_1_a4/ LA - ru ID - FAA_1968_2_1_a4 ER -