1. Eurocode 3. Design of steel structures Part 1.1: General rules and rules for buildings. CEN Brussels 2004, CEN Document EN 1993-1-1:2004 [E].
2. Specification for structural steel buildings (ANSI/AISC 360–10);Committee A,2010
3. Construction AIoS. Load and resistance factor design: Amer Inst of Steel Construction; 2001.
4. Règles de Conception et de Calcul des Structures en Acier «CCM97». ministère de l’habitat et de l’urbanisme Algérie;DTR-BC-2.44,1998
5. Julian O, Lawrence L. Notes on J and L nomographs for determination of effective lengths. unpublished report. 1959.