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3. Yu. M. Volchkov, G. V. Ivanov, and V. D. Kurguzov, “Approximation of equations describing elastoplastic deformation,” Din. Sploshnoi Sredy (Sb. Nauch. Tr., AN SSSR, Sib. Otd-Nie, In-t Gidrodinamiki),92 (1989).
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