@article{EJDE_2003__2003__a69,
     author = {Liu,  Yuji and Ge,  Weigao},
     title = {Positive solutions of boundary value problems for \(2m\)-order differential equations},
     journal = {Electronic journal of differential equations},
     year = {2003},
     volume = {2003},
     zbl = {1042.34049},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a69/}
}