Helmholtz方程弱形式 weak forms of Helmholtz equations

变系数Helmholtz方程 Helmholtz equations with variable coefficients

弯曲界面Helmholtz方程 Helmholtz equation with curve interface

类Helmholtz方程 analogic Helmholtz equation

广义helmholtz方程 generalized helmholtz s equation ; the generalized helmholtz s equation ; generalized helmholtz ' s equation

广义Helmholtz方程 the generalized Helmholtz's equation

helmholtz方程外问题 exterior helmholtz problem

自由界面HelmholtZ方程 Free interface Helmholtz equation

Helmholtz积分方程 Helmholtz integral equation