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Additional information
A. M. Gor'kii Perm' State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 9, No. 1, pp. 137–149, October, 1971.
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Nepomnyashchii, Y.A., Nepomnyashchii, A.A. Collective spectrum of coherent crystals. Theor Math Phys 9, 1033–1041 (1971). https://doi.org/10.1007/BF01036033
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DOI: https://doi.org/10.1007/BF01036033