1. Surface waves in hexagonal crystals;Al'shits;Sov. Phys. Crystallogr.,1978
2. Elastic waves in triclinic crystals. I. General theory and the degeneracy problem;Al'shits;Sov. Phys. Crystallogr.,1979
3. Elastic waves in triclinic crystals. II. Topology of polarization fields and some general theorems;Al'shits;Sov. Phys. Crystallogr.,1979
4. Elastic waves in triclinic crystals. III. The problem of existence of exceptional surface waves and some of their general properties;Al'shits;Sov. Phys. Crystallogr.,1979