TY - JOUR AU - V. F. Butuzov AU - V. V. Kiryushin TI - A Two-Dimensional Step-Like Contrast Structure in the Case of a Multiple Root of the Transition Line Equation JO - Differencialʹnye uravneniâ PY - 2001 SP - 495 EP - 510 VL - 37 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_2001_37_4_a8/ LA - ru ID - DE_2001_37_4_a8 ER -