LMAM,;
School;
of;
Mathematical;
Sciences,;
Peking;
University,;
Beijing;
100871,;
China;
School;
of;
Mathematical;
Sciences,;
Heilongjiang;
University,;
Harbin;
150080,;
China;
School;
of;
Mathematical;
Sciences,;
Jilin;
University,;
Changchun;
130012,;
China;
uniqueness,; stability,; Maxwell's; equations,; inverse; scattering; problem.;