@article{JRAM_1991__421_153361,
     author = {D.G. Figueiredo and B. Ruf},
     title = {On a superlinear {Sturm-Liouville} equation and a related bouncing problem.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--22},
     publisher = {mathdoc},
     volume = {421},
     year = {1991},
     zbl = {0732.34024},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1991__421_153361/}
}