1. Bathe, K.-J., 1982, “Finite Element Procedures in Engineering Analysis,” Prentice-Hall, New Jersey.
2. Fraeijs de Veubeke, B., 1965, Displacement and equilibrium models in the finite element method, in: “Stress Analysis,” Zienkiewicz, O. C., and Holister, G. S., Eds., Wiley, London.
3. Liolios, A. A., 1982, Upper and lower bounds in unilateral and nonlinear Structural elastostatics, Jnl Appl. Math. Mech. (ZAMM), 62:T138.
4. Liolios, A. A., 1985, A direct formulation of dual extremum principles in unilateral elastostatics by the generalization of the hypercircle method, Jnl Appl. Math. Mech. (ZAMM), 65:T348.
5. Liolios, A. A., 1989, A linear complementarity approach to the nonconvex dynamic problem of unilateral contact with friction between adjacent structures, Jnl Appl. Math. Mech. (ZAMM), 69:T420.