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3. J. Tucker and V. Rampton, Microwave Ultrasonics in Solid State Physics (North-Holland, Amsterdam, 1971; Mir, Moscow, 1975).
4. H. J. Maris, Phys. Acoust. VII, 280 (1971).
5. B. M. Mogilevskiĭ and A. F. Chudnovskiĭ, Thermal Conductivity of Semiconductors (Nauka, Moscow, 1972) [in Russian].