@article{EJDE_2009__2009__a134,
     author = {Wang,  Yong and Tian,  Junkang},
     title = {Periodic solutions for a {Li\'enard} equation with two deviating arguments},
     journal = {Electronic journal of differential equations},
     year = {2009},
     volume = {2009},
     zbl = {1186.34093},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a134/}
}