@article{EJDE_2003__2003__a103,
     author = {Raffoul, Youssef N.},
     title = {Periodic solutions for neutral nonlinear differential equations with functional delay},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2003},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a103/}
}