@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/