1. Spence, J. and Boyle, J. T. Private Communication.
2. An estimate of the bending stresses induced by pressure in a tube that is not initially quite circular;Haigh,1936
3. A simple stress analysis for out-of-round pressurised pipe bends;Boyle;Int. J. Pres. Ves. & Piping,1981
4. The non-linear analysis of pressurised curved pipes;Boyle,1977
5. The effect of thickness variations on the behaviour of smooth curved pipes under external bending;Spence,1978