@article{EJDE_2008__2008__a39,
     author = {Van Le, Ut and Nguyen, Lan T.T.},
     title = {Existence of solutions for systems of self-referred and hereditary differential equations},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2008},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2008__2008__a39/}
}