1. Horizontal rays and vertical modes;Burridge,1977
2. Propagation in slowly varying wave-guides;Smith;SIAM J. Appl. Math.,1972
3. Integration of the dynamics boundary layer equations;Kaplunov;Izv. Akad. Nauk SSSR Mekh. Tverd. Tela,1990
4. Quasi-modes of a weakly curved waveguide;Gridin;Proc. R. Soc. Lond. Ser. A,2003
5. Elastic Waves at High Frequencies: Techniques for Radiation and Diffraction of Elastic and Surface Waves,2012