References
- Alessandrini , G. Matzoh ball soup: a symmetry result for the heat equation . to appear on J. Analyse Math ,
- Doob , J.L. 1984 . Classical Potential Theory and Its Probabilistic Counterpart , Berlin : Springer-Verlag .
- Friedman , A. 1964 . Partial Differential Equations of Parabolic Type , Englewood Cliffs : Prentice-Hall .
- Gilbarg , A. and Trudinger , N.S . 1983 . Elliptic Partial Differential Equations of Second Order , Berlin : Springer- Verlag .
- Klamkin , M.S. 1964 . A physical characterization of a sphere Problem 64-5 . SIAM Rev , 6
- Morrey , C.B. 1966 . Multiple Integrals in the Calculus of Variations , New York : Springer-Verlag .
- Muller , C. 1954 . On the behavior of the solutions of the differential equations ▵U=F(x,U ) in the neighborhood of a point . Comm. Pure Appl. Math , 7 : 505 – 515 .
- Serrin , J. 1971 . A symmetry problem in potential theory . Arch. Rat. Mech. Anal , 43 : 304 – 318 .
- Zalcman , L. 1987 . Some inverse problems of potential theory . Contemporary Mathematics , 63 : 337 – 350 .
- Yosida , K. 1980 . Functional Analysis , Berlin : Springer-Verlag .