TY - JOUR AU - E. A. Derkunova TI - On refining the asymptotics of a singular perturbed problem solution as a result of separation of the roots of a degenerate equation JO - Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematika, mehanika, fizika PY - 2019 SP - 5 EP - 11 VL - 11 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/VYURM_2019_11_4_a0/ LA - ru ID - VYURM_2019_11_4_a0 ER -