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2. Timošenko S. P.;M Gere J.(1961)Theory of elastic stability. 2nded. New York. McGraw-Hill.
3. Die Knickfestigkeit gerader Stäbe;Engesser F.;Zentralbl Bauverwalt.,1891
4. Effective second moment of area of uniform built-up members
5. CEN(2005)EN 1993-1-8: Eurocode 3: Design of steel structures – Part 1-8: Design of joints. Brussels