1. C. Taig, Structural analysis by the matrix displacement method, English Electric Aviation Report No. S017, 1961
2. Engineering application of numerical integration in stiffness method;Irons;J. AIAA,1966
3. G. Strang, G.J. Fix, An Analysis of the Finite Element Method, Ch. 3, Prentice-Hall, Englewood Cliffs, 1973
4. O.C. Zienkiewicz, R.L. Taylor, The Finite Element Method, Chs. 7 and 8, 4th ed., vol. 1, McGraw-Hill, London, 1988
5. Effects of element distortions on the performance of isoparametric elements;Lee;Int. J. Num. Meth. Eng,1993