1. EN 10210 (2006): Hot finished structural hollow sections of non-alloy and fine grain steels - Part 1: Technical delivery conditions; - Part 2: Tolerances, dimensions and sectional properties.
2. EN 10219 (2006): Cold formed welded structural hollow sections of non-alloy and fine grain steels - Part 1: Technical delivery conditions; - Part 2: Tolerances, dimensions and sectional properties.
3. EN 1993-1-1 (2010): Eurocode 3: Design of steel structures. Part 1-1: General rules and rules for buildings.
4. EN 1993-1-8 (2010): Eurocode 3: Design of steel structures. Part 1-8: Design of joints; including Corrigendum dated July 2009.
5. Ritakallio , P. O. Cold-formed high-strength tubes for structural applications. Steel Construction, 5 (2012), No. 3, pp. 158-167.