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Additional information
Simferopol' State University. Translated from Prikladnaya Mekhanika, Vol. 12, No. 2, pp. 96–99, February, 1976.
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Podvalov, V.A. Estimation of fundamental frequency of membranes and plates through replacement of their contour by a circle. Soviet Applied Mechanics 12, 179–182 (1976). https://doi.org/10.1007/BF00901891
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DOI: https://doi.org/10.1007/BF00901891