1. On the parametric response of structures;Evan-Iwanowski;Applied Mechanics Review,1965
2. The Dynamic Stability of Elastic Systems;Bolotin,1965
3. Stability of columns and strings under periodically varying forces;Lubkin;Quarterly of Applied Mechanics,1943
4. Dynamical stability of a column under periodic longitudinal forces;Utida,1940
5. The parametric response of imperfect columns;Moody,1967