%0 Journal Article %A El-Bassiouny, A.F. %T Parametrically excited nonlinear systems: A comparison of two methods. %J International Journal of Mathematics and Mathematical Sciences %D 2002 %P 739 %V 32 %N 12 %I mathdoc %U https://geodesic-test.mathdoc.fr/articles/10.1155/S0161171202007019/ %R 10.1155/S0161171202007019 %G en %F 10_1155_S0161171202007019