1. Aki, K., and P. Richards, 1980, Quantitative seismology: Theory and methods: W. H. Freeman.
2. Berkhout, A. J., 1987, Applied seismic wave theory: Elsevier.
3. Berkhout, A. J., and C. P. A. Wapenaar, 1989, One-way versions of the Kirchhoff integral: Geophysics, 54, 460–467, 10.1190/1.1442672.
4. Boundary Integral Equations and Boundary Elements Methods in Elastodynamics
5. Colton, D., and R. Kress, 1983, Integral equation methods in scattering theory: John Wiley & Sons.