1. Principles of structural stability theory;Chajes,1974
2. The ultimate strength of composite columns in biaxial bending;Virdi;Proceedings of the Institution of Civil Engineers,1973
3. Composite columns in biaxial bending;Virdi,1982
4. Design of circular and rectangular hollow section columns;Virdi;Journal of Constructional Steel Research,1981
5. The ultimate strength of biaxially restrained columns;Virdi;Proceeding of the Institution of Civil Engineers,1976