2ITA WG Main Tenance and Repair. Report on the damaging effects of water on tunnels during their working life[J]. Tunneling and Underground Space Technology, 1991,6(1) :11-76.
3YEE K S. Numerical solution of initial boundary value problems involving Maxwell's equations in isotropic Media[J]. IEEE Trans Antennas Propagate, 1966,14:302-330.