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V. P. Romanencko, D. V. Sizov, G. P. Illarionov. "HOLLOW BILLET PUNCH PIERCING PROCESS GEOMETRY PARAMETERS EXPERIMENTAL STUDY." Izvestiya Visshikh Uchebnykh Zavedenii Chernaya Metallurgiya = Izvestiya Ferrous Metallurgy 55.11 (2012) 31-34