@article{EJDE_2009__2009__a26,
     author = {Purnaras,  Ioannis K.},
     title = {Nonnegative solutions to an integral equation and its applications to systems of boundary value problems},
     journal = {Electronic journal of differential equations},
     year = {2009},
     volume = {2009},
     zbl = {1167.45002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a26/}
}