Geodesic
On the smooth-fit principle in $\mathbb R^n$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 62 (2007) no. 4, pp. 781-783 
A. F. Aliev. On the smooth-fit principle in $\mathbb R^n$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 62 (2007) no. 4, pp. 781-783. http://geodesic.mathdoc.fr/item/RM_2007_62_4_a6/
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[2] A. Shiryaev, G. Peskir, Optimal stopping and free-boundary problems, Lectures Math. ETH Zurich, Birkhäuser, Basel, 2006 | MR | Zbl