TY - JOUR AU - T. N. Sysoeva TI - A singularly perturbed boundary value problem of hyperbolic type JO - Differencialʹnye uravneniâ PY - 1985 SP - 531 EP - 533 VL - 21 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1985_21_3_a25/ LA - ru ID - DE_1985_21_3_a25 ER -