@article{EJDE_2007__2007__a223,
     author = {Graef, John R. and Henderson, Johnny and Yang, Bo},
     title = {Positive solutions of a nonlinear higher order boundary-value problem},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2007},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a223/}
}