@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/