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2. British Standards Institution, EN 10210 Hot Finished Structural Hollow Sections of Non-Alloy and Fine Grain Steels. 2006.
3. British Standards Institution, EN 10219 Cold-formed welded structural hollow sections of non-alloy and fine grain steels. 2006.
4. The Roll-Forming Process Analysis of the Situation and Development Trend
5. Rotation capacity and ductility of square hollow sections