TY - JOUR AU - A. Ya. Dubovitskii AU - V. A. Dubovitskii TI - A criterion for the existence of a meaningful maximum principle in a problem with phase constraints JO - Differencialʹnye uravneniâ PY - 1995 SP - 1634 EP - 1640 VL - 31 IS - 10 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1995_31_10_a4/ LA - ru ID - DE_1995_31_10_a4 ER -