@article{05632486,
title = {Higher-order approximate periodic solutions of a nonlinear oscillator with discontinuity by variational approach.},
journal = {Mathematical Problems in Engineering},
volume = {2009},
year = {2009},
doi = {10.1155/2009/450862},
zbl = {1188.34012},
language = {en},
url = {http://dml.mathdoc.fr/item/05632486}
}
Kaya, M.Orhan; Demirbağ, S.Altay; Zengin, F.Özen. Higher-order approximate periodic solutions of a nonlinear oscillator with discontinuity by variational approach.. Mathematical Problems in Engineering, Tome 2009 (2009) . doi : 10.1155/2009/450862. http://gdmltest.u-ga.fr/item/05632486/