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Contents 1. Introduction . 2. Equations for the lattice vibrations for the case of an isolated point defect 3. Local lattice vibrations near isolated point defects 4. Effect of point defects on vibrations corresponding to the continuous 5 . Equations of phonon dynamics in a distorted crystal , 6. Lattice vibrations near a linear defect (dislocations) . 7 . Lattice vibrations in the presence of a two-dimensional (plane) defect 8. Conclusion . , References . . . frequency spectrum .

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