@article{RM_1997_52_1_a4,
     author = {O. A. Oleinik and G. Kallianpur},
     title = {On free boundary problems arising in probability theory (existence theorems)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {222--223},
     publisher = {mathdoc},
     volume = {52},
     number = {1},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1997_52_1_a4/}
}