1. “Stress Analysis by Stiffnesses Using Numerical Integration,”;Irons,1963
2. “Isoparametric and Associated Element Families for Two and Three Dimensional Analysis,”;Zienkiewicz,1969
3. Ahmad, S., Irons, B. M., and Zienkiewicz, O. C., “Curved Thick Shell and Membrane Elements with Particular Reference to Axisymmetric Problems,” Proc. Conf. Methods Struct. Mech., 2nd Wright–Patterson AFB, Ohio (1968).
4. “Stress Analysis of Axisymmetric Solids Utilizing Higher Order Quadrilateral Finite Elements,”;Doherty,1969
5. “Reduced Integration Techniques in General Analysis of Plates and Shells,”;Zienkiewicz;Int. J. Numer. Methods Eng.,1971