@article{EJDE_2000__2000__a0,
     author = {Haile,  Craig},
     title = {A second eigenvalue bound for the {Dirichlet-Schr\"odinger} equation with a radially symmetric potential},
     journal = {Electronic journal of differential equations},
     year = {2000},
     volume = {2000},
     zbl = {0941.35017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a0/}
}