@article{EJDE_2009__2009__a141,
     author = {Moussaoui,  Toufik and Precup,  Radu},
     title = {Existence of solutions for second-order differential equations and systems on infinite intervals},
     journal = {Electronic journal of differential equations},
     year = {2009},
     volume = {2009},
     zbl = {1179.34029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a141/}
}