TY - JOUR AU - Yu. A. Konyaev AU - Yu. S. Fedorov TI - Asymptotic analysis of certain classes of singularly perturbed problems on the semiaxis JO - Matematičeskie zametki PY - 1997 SP - 111 EP - 117 VL - 62 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1997_62_1_a11/ LA - ru ID - MZM_1997_62_1_a11 ER -