@article{EJDE_2012__2012__a12,
     author = {Heidarkhani,  Shapour},
     title = {Non-trivial solutions for two-point boundary-value problems of fourth-order {Sturm-Liouville} type equations},
     journal = {Electronic journal of differential equations},
     year = {2012},
     volume = {2012},
     zbl = {1252.34035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a12/}
}