TY - JOUR AU - L. B. Zelenko TI - The limiting spectrum of a~non-self-conjugate second-order differential operator with slowly varying coefficients JO - Matematičeskie zametki PY - 1973 SP - 135 EP - 146 VL - 13 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1973_13_1_a16/ LA - ru ID - MZM_1973_13_1_a16 ER -