@article{01883653, title = {Parametrically excited nonlinear systems: A comparison of two methods.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {30}, year = {2002}, pages = {739-761}, doi = {10.1155/S0161171202007019}, zbl = {1012.65141}, language = {en}, url = {http://dml.mathdoc.fr/item/01883653} }
El-Bassiouny, A.F. Parametrically excited nonlinear systems: A comparison of two methods.. International Journal of Mathematics and Mathematical Sciences, Tome 30 (2002) pp. 739-761. doi : 10.1155/S0161171202007019. http://gdmltest.u-ga.fr/item/01883653/