1. The Finite Element Method in Plane Stress Analysis;Clough,1960
2. Finite Element Analysis of Two-Dimensional Structures;Wilson;University of California(Berkeley), Structural Engineering Laboratory Report No. 63-2,1963
3. Solutions of problems of elasticity by the framework method;Hrennikoff;J. appl. Mech.,1941
4. Mathematical Theory of Elasticity;Sokolnikoff,1956
5. Theory of Elasticity;Timoshenko,1951