[1] R. H. MacNeal, “Derivation of Element Stiffness Matrices by Assumed Strain Distributions,” Nuclear Engineering and Design, Vol. 70, No. 1, 1982, pp. 3-12. ttp://dx.doi.org/10.1016/0029-5493(82)90262-X
[2] R. Piltner and R. L. Taylor, “A Systematic Constructions of B-Bar Functions for Linear and Nonlinear Mixed-Enhanced Finite Elements for Plane Elasticity Problems,” International Journal for Numerical Methods in Engineering, Vol. 44, No. 5, 1997, pp. 615-639. http://dx.doi.org/10.1002/(SICI)1097-0207(19990220)44:5<615::AID-NME518>3.0.CO;2-U
[3] T. H. H. Pian, “Derivation of Element Stiffness Matrices by Assumed Stress Distributions,” AIAA Journal, Vol. 2, No. 7, 1964, pp. 1333-1336. http://dx.doi.org/10.2514/3.2546
[4] T. H. H. Pian and K. Sumihara, “Rational Approach for Assumed Stress Finite Elements,” International Journal for Numerical Methods in Engineering, Vol. 20, No. 9, 1984, pp. 1685-1695. http://dx.doi.org/10.1002/nme.1620200911
[5] S. Cen, Y. Q. Long, et al., “Application of the Quadrilateral Area Co-Ordinate Method: A New Element for Mindlin-Reissner Plate,” International Journal for Numerical Methods in Engineering, Vol. 66, No. 1, 2006, pp. 1-45. http://dx.doi.org/10.1002/nme.1533
[6] T. H. H. Pian and C. C. Wu, “Hybrid and Incompatible Finite Element Methods,” Chapman & Hall/CRC, Boca Raton, 2006.
[7] X. M. Chen, Y. Q. Long and Y. Xu, “Construction of Quadrilateral Membrane Elements with Drilling DOF Using Area Coordinate Method,” Engineering Mechanics, Vol. 20, No. 6, 2003, pp. 6-11.
[8] Y. Q. Long, J. X. Li, Z. F. Long and S. Cen, “Area Coordinates Used in Quadrilateral Elements,” Communications in Numerical Methods in Engineering, Vol. 15, No. 8, 1999, pp. 533-545. http://dx.doi.org/10.1002/(SICI)1099-0887(199908)15:8<533::AID-CNM265>3.0.CO;2-D
[9] Z. F. Long, J. X. Li, S. Cen and Y. Q. Long, “Some Basic Formulae for Area Coordinates Used in Quadrilateral Elements,” Communications in Numerical Methods in Engineering, Vol. 15, No. 12, 1999, pp. 841-852. http://dx.doi.org/10.1002/(SICI)1099-0887(199912)15:12<841::AID-CNM290>3.0.CO;2-A
[10] Z. F.Long, X. M. Chen and Y. Q. Long, “Second-Order Quadrilateral Plane Element Using Area Coordinates,” Engineering Mechanics, Vol. 18, No. 4, 2001, pp. 95-101.
[11] X. G. Fu and Y. Q. Long, “Generalized Conforming Quadrilateral Plane Elements Based on Analytical Trial Functions,” Engineering Mechanics, Vol. 19, No. 4, 2002, pp. 12-16.
[12] R. D. Cook, D. S. Malkus and M. E. Plesha, “Concepts and Applications of Finite Element Analysis,” 3rd Edition, John Wiley & Sons, Inc., New York, 1989.