1. Propagation of waves in a piezoelectric layer with a weak horizontal nonhomogeneity;Babich;Wave Motion,1997
2. The surface waves in nonhomogeneous in vertical direction with weak horizontal nonhomogeneity;Babich;Izvestiya AN SSSR, Fizika Zemli,1976
3. Space-time Ray Method. Linear and Nonlinear Waves;Babich,1985
4. Space-time ray method of calculation of waves in weak nonhomogeneous layered medium;Babich,1980
5. Propagation in slowly varying waveguides;Bretherton,1968