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Translated from Matematicheskie Zametki, Vol. 54, No. 6, pp. 10–21, December, 1993.
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Gadyl'shin, R.R. Characteristic frequencies of bodies with thin spikes. I. Convergence and estimates. Math Notes 54, 1192–1199 (1993). https://doi.org/10.1007/BF01209080
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DOI: https://doi.org/10.1007/BF01209080