1. Macchi, G., “Analysis Proposal Based on the Theory of Imposed Rotations”, (in French), CEB Bulletin, No. 21, 1960.
2. Iabse, Final Report, Colloquium on “Advanced Mechanics of Reinforced Concrete” Delft, The Netherlands, 1981.
3. Arenas, J.J., “Second-Order Analysis of Reinforced Concrete Columns”, (in Spanish), Ed. Tecnicos Asociados, Barcelona, Spain, 1980.