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Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 15, No. 1, pp. 38–41, January–February, 1979.
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Pan'ko, I.N., Zazulyak, V.A. Four-point bending of a cylindrical specimen with an external circumferential notch. Soviet Materials Science 15, 33–35 (1979). https://doi.org/10.1007/BF00718322
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DOI: https://doi.org/10.1007/BF00718322