1. Influence of Internal Damping on Aircraft Resonance.- 2. Upper and Lower Bounds in Matrix Structural Analysis.- 3. Displacement and Equilibrium Models in the Finite Element Method.- 4. Variational Principles in Fluid Mechanics.- 5. Strain—Energy Bounds in Finite—Element Analysis by Slab Analogy.- 6. A Conforming Finite Element for Plate Bending.- 7. An Equilibrium Model for Plate Bending.- 8. The Theoretical Design Laws of Warping—Free Multicellular Box Beams.- 9. The Dual Principles of Elastodynamics. Finite Element Applications.- 10. Dual Analysis by Finite Elements. Linear and Non Linear Applications, Part II — Non Linear Theories — Non Linear Shell Theory.- 11. Dual Analysis for Heat Conduction Problems by Finite Elements.- 12. A New Variational Principle for Finite Elastic Displacements.- 13. Matrix Structural Analysis.- 14. Diffusive Equilibrium Models.- 15. Variational Principles and the Patch Test.- 16. Stress Function Approach.- 17. The Dynamics of Flexible Bodies.