References

1. Reynolds, C.E. [1971] "Reinforced Concrete Designer's Handbook", Cement and Concrete Association, London
2. Constructional Steel Research and Development Organisation [1979], "Steel Designers' Manual", The English Language Book Society and Crosby Lockwood Staples
3. Heyman, J. [1957] "Plastic Design of Portal Frames", Cambridge University Press
4. Baker, J.F. "Plastic Design in Steel to BS: 968", BCSA Publication No. 21