1. Tensor Analysis for Physicists;Schouten,1951
2. Flux of energy for elastic waves in anisotropic media;Synge,1956
3. Crystal Acoustics;Musgrave,1970
4. Theory of Elastic Waves in Crystals;Fedorov,1968
5. A note on plane waves in linear conservative systems;Hayes;Quart. J. Mech. Appl. Math.,1975