TY - JOUR AU - O. A. Oleinik AU - G. Kallianpur TI - On free boundary problems arising in probability theory (existence theorems) JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1997 SP - 222 EP - 223 VL - 52 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1997_52_1_a4/ LA - en ID - RM_1997_52_1_a4 ER -