%0 Journal Article %A N. V. Krylov %T The problem with two free boundaries for an elliptic equation and the optimal stopping of a Markov process %J Doklady Akademii Nauk %D 1970 %P 1263-1265 %V 194 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1970_194_6_a4/ %G ru %F DAN_1970_194_6_a4