@article{EJDE_2004__2004__a99,
     author = {Liu, Yansheng},
     title = {Multiple positive solutions to fourth-order singular boundary-value problems in abstract spaces},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2004},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a99/}
}