@article{EJDE_2007__2007__a183,
     author = {Yang, Dandan and Zhu, Hongbo and Bai, Chuanzhi},
     title = {Positive solutions for semipositone fourth-order two-point boundary value problems},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2007},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a183/}
}