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Translated from Mekhanika Kompozitnykh Materialov, No. 2, pp. 263–270, March–April, 1982
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Lizarev, A.D. Estimates of upper and lower bounds and the density of the eigenfrequencies of three-layer and transversely isotropic spherical shells. Mech Compos Mater 18, 182–188 (1982). https://doi.org/10.1007/BF00604839
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DOI: https://doi.org/10.1007/BF00604839