@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},
     publisher = {mathdoc},
     volume = {2003},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a69/}
}