1. The Finite Element Method in Engineering Science;Zienkiewicz,1977
2. Higher-order finite element for plane stress;Tocher;J. Engng Meek Div. ASCE,1967
3. A simple triangular shell element revisited;Olson;Int. J. Num. Meth. Engng,1979
4. On triangular displacement elements for the bending of thin plates;Mohr,1979