@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/