TY - JOUR AU - L. A. Sakhnovich TI - Spectral problems for systems of equations on the axis JO - Doklady Akademii Nauk PY - 1987 SP - 1052 EP - 1056 VL - 296 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1987_296_5_a5/ LA - ru ID - DAN_1987_296_5_a5 ER -