@article{05897653,
title = {Lagrangian stability of a class of second-order periodic systems.},
journal = {Boundary Value Problems [electronic only]},
volume = {2011},
year = {2011},
doi = {10.1155/2011/845413},
zbl = {1222.34047},
language = {en},
url = {http://dml.mathdoc.fr/item/05897653}
}
Jiang, Shunjun; Xu, Junxiang; Zhang, Fubao. Lagrangian stability of a class of second-order periodic systems.. Boundary Value Problems [electronic only], Tome 2011 (2011) . doi : 10.1155/2011/845413. http://gdmltest.u-ga.fr/item/05897653/