@article{EJDE_2007__2007__a24,
     author = {Caldwell, Scott and Castro, Alfonso and Shivaji, Ratnasingham and Unsurangsie, Sumalee},
     title = {Positive solutions for classes of multiparameter elliptic semipositone problems},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2007},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a24/}
}