TY - JOUR AU - M. I. Matiichuk AU - I. D. Pukal'skii TI - A problem with directional derivative for degenerate parabolic equation JO - Matematičeskie zametki PY - 1980 SP - 533 EP - 544 VL - 28 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1980_28_4_a5/ LA - ru ID - MZM_1980_28_4_a5 ER -