TY - JOUR AU - V. F. Butuzov AU - V. V. Kiryushin TI - A Step-Like Contrast Structure for the Case of a Multiple Root of the Transition Point Equation (the Critical Case) JO - Differencialʹnye uravneniâ PY - 2001 SP - 171 EP - 180 VL - 37 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_2001_37_2_a3/ LA - ru ID - DE_2001_37_2_a3 ER -