6Andelfinger U, Ramm E. EAS-elements for two-dimensional, three-dimensional, plate and shell structures and their equivalence to HR-elements [J]. Int J Num Meth Eng, 1993, 36: 1311- 1337.
7Piltner R, Taylor R L. A systematic constructions of B-bar functions for linear and nonlinear mixed-enhanced finite elements for plane elasticity problems [J]. Int J Num Meth Eng, 1997, 44: 615-639.
8Bazeley G P, Cheung Y K, Irons B M, et al. Triangular elements in bending Conforming and non-conforming solutions [A]. Proc Conf Matrix Methods in Structural Mechanics [C]. Ohio, USA 1965.
9Cook R D. Improved two-dimensional finite element [J]. J Struct Div, ASCE, 1974, 100ST9: 1851- 1863.
10LONG Yuqiu, XU Yin. Generalized conforming triangular membrane element with vertex rigid rotational freedoms [J].Finite Element in Analysis and Design, 1994, 17:259 -271.