The DRM has become a common method to evaluate the particular solution.
For the application of the BPM to Helmholtz,[REF] Poisson[REF] and plate bending problems,[REF] the high-order fundamental solution or general solution, harmonic function[REF] or Trefftz function (T-complete functions)[REF] are often used, for instance, those of Berger, Winkler, and vibrational thin plate equations [REF].