1. Displacement and equilibrium models in finite element method;de Veubeke,1965
2. Refined Finite Elecent Analysis of Linear and Non-linear Two-dimensional Structures;Fellippa,1966
3. Triangular elements with linearly varying strain for the matrix displacement method;Argyris;J. Royal Aeron. Soc.,1965
4. The Finite Element Method in Engineering Science;Zienkiewicz,1971
5. Theory of Elasticity of an Anisotropic Elastic Body;Lekhnitskii,1963