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4. SOMERSET, J. H. and EVAN-IWANOWSKI, R. M., (1965). Experiments on parametric instability of columns, Developments in Theoretical and Applied Mechanics, Vol. II, Proceedings of the Second Southeastern Conference on Theoretical and Applied Mechanics, Pergamon Press, 1965, 503–525.
5. Effects of longitudinal inertia upon the parametric response of elastic columns;EVENSEN;Journal of Applied Mechanics,1966