1. Bijlaard P. P. and Fisher G. P. (1952). “Interaction of column and local buckling in compression members ” NACA T.N. 2640.
2. Bijlaard P. P. and Fisher G. P. (1953). “Column strength of H‐section and square tubes in the post‐buckling range of the component plates ” NACA T.N. 2994.
3. Bradfield C. D. and Chladny E. (1979). “A review of the elastic‐plastic analysis of steel plates loaded in in‐plane compression ” Report CUED/D‐Struct/TR.77 Dept. of Engrg. Cambridge Univ. Cambridge U.K.
4. “Steel concrete and composite bridges ” (1980). Specification for materials and workmanship steel BS5400 Part 6 British Standards Instn. London U.K.
5. Curvature and the Solution of Eccentrically Loaded Columns