Abstract
Wave processes in real crystals are described by covariant first-order partial differential equations.
Naimi and Khzardzhyan [1] have recently shown that the second-order equations
,
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 6–9, December, 1980.
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Olemskoi, A.I. Theory of elastic waves. Soviet Physics Journal 23, 988–991 (1980). https://doi.org/10.1007/BF00896438
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DOI: https://doi.org/10.1007/BF00896438