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https://www.mediafire.com/file/mfqjkl6ol42itaq/Zeitschrift_fu%u0308r_Metallkunde_Volume_94_issue_12_2003_%5Bdoi_10.3139%252F146.031300%5D_Lee%2C_W._B.%3B_Jung%2C_S._B._--_Effect_of_microstructural_variation_on_the_Cu_CK45_carbon_steel_friction_weld_joint.pdf/file