@article{EJDE_2004__2004__a55,
     author = {Gyulov,  Tihomir and Tersian,  Stepan},
     title = {Existence of trivial and nontrivial solutions of a fourth-order ordinary differential equation},
     journal = {Electronic journal of differential equations},
     year = {2004},
     volume = {2004},
     zbl = {1058.34016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a55/}
}