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Prikladnaya Mekhanika, Vol. 4, No. 1, pp. 70–74, 1968
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Andreev, L.N., Troitskii, V.A. On determining the number of natural frequencies of an elastic bar system over a given interval. Soviet Applied Mechanics 4, 43–45 (1968). https://doi.org/10.1007/BF00920323
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DOI: https://doi.org/10.1007/BF00920323