@article{05237060,
title = {Nonlinear periodic systems with the },
journal = {Abstract and Applied Analysis},
volume = {2007},
year = {2007},
doi = {10.1155/2007/80394},
zbl = {1156.34011},
language = {en},
url = {http://dml.mathdoc.fr/item/05237060}
}
Papalini, Francesca. Nonlinear periodic systems with the . Abstract and Applied Analysis, Tome 2007 (2007) . doi : 10.1155/2007/80394. http://gdmltest.u-ga.fr/item/05237060/