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Translated from Poroshkovaya Metallurgiya, No. 5(317), pp. 28–34, May, 1989.
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Shtern, M.B. A model of deformation processes of compressible materials with pore formation taken into account. I. Determining equations and loading surface. Powder Metall Met Ceram 28, 359–364 (1989). https://doi.org/10.1007/BF00795037
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DOI: https://doi.org/10.1007/BF00795037