[1] Wilson, E.L., et al., Incompatible displacement models, Numerical and Computer Methods in Structural Mechanics, ed. Fenves S.J., et al., Academic Press, New York(1973), 43-57.
[2] Taylor, R.L., et al., A non-conforming element for stress analysis, Int. J. Num. Meth. Engng., 10(1976), 1211-1219.
[3] Wachspress, E.L., Incompatible quadrilateral basis functions, Int. J. Num. Meth. Engng., 12(1978), 589-595.
[4] Chen Wan-ji and Tang Li-min, Isoparametric quasi-conforming element, J. of Dalian Institute of Technology, 20, 1(1981), 63-74.(in Chinese)
[5] Pian, T.H.H. and Wu Chang-chun, General formulation of incompatible shape function and an incompatible isoparametric element, Proc. of the Invitational China-American Workshop on FEM, Chengde, China, June 2-6(1986), 159-165.
[6] Long Yu-qiu and Xin Ke-qui, Generalized conforming element, China Civil Engineering Journal, 20, 1(1987), 1-14.(in Chinese)
[7] Cook, R.D., Improved two-dimensional finite element, J. Struct. Div., ASCE, 100. ST9(1974), 1851-1863.