TY - JOUR AU - M. A. Valiev AU - S. A. Lomov TI - A general approach to the asymptotic integration of singularly perturbed problems in the case of an unbounded nonselfadjoint operator JO - Doklady Akademii Nauk PY - 1977 SP - 11 EP - 13 VL - 236 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1977_236_1_a0/ LA - ru ID - DAN_1977_236_1_a0 ER -