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2. A. G. Aslanyan and V. B. Lidskii, Distribution of the Natural Frequencies of Thin Elastic Shells [in Russian], Nauka, Moscow (1974).
3. V. V. Bolotin, Random Vibrations of Elastic Systems, Kluwer, Dordrecht (1984).
4. A. L. Gol’denveizer, V. B. Lidskii, and P. E. Tovstik, Free Vibrations of Thin Elastic Shells [in Russian], Nauka, Moscow (1979).
5. V. T. Grinchenko and V. V. Meleshko, Harmonic Vibrations and Waves in Elastic Bodies [in Russian], Naukova Dumka, Kyiv (1981).