1. Slope–deflection equations for stability and second-order analysis of Timoshenko beam–column structures with semi-rigid connections;Aristizabal-Ochoa;Eng Struct,2008
2. On the buckling and the lateral rigidity of helical compression springs;Haringx,1942
3. Theory of elastic stability;Timoshenko,1964
4. Die Knickfestigkeit gerader Stäbe;Engesser;Zent Bauverwal,1891
5. Arguments for and against Engesser’s buckling formulas;Ziegler,1982