@article{05367991,
title = {Existence of solutions of periodic boundary value problems for impulsive functional Duffing equations at nonresonance case.},
journal = {Boundary Value Problems [electronic only]},
volume = {2008},
year = {2008},
doi = {10.1155/2008/937138},
zbl = {1158.34337},
language = {en},
url = {http://dml.mathdoc.fr/item/05367991}
}
Liu, Xingyuan; Liu, Yuji. Existence of solutions of periodic boundary value problems for impulsive functional Duffing equations at nonresonance case.. Boundary Value Problems [electronic only], Tome 2008 (2008) . doi : 10.1155/2008/937138. http://gdmltest.u-ga.fr/item/05367991/