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2. Principles of Structural Stability;Ziegler,1977
3. On the geometrical stiffness matrix of a beam in space—a consistent approach;Argyris;Computational Methods in Applied Mechanics and Engineering,1979
4. Variational Methods in Elasticity and Plasticity;Washizu,1956
5. The Dynamic Stiffness and Substructures;Leung,1993