@article{EJDE_2004__2004__a70,
     author = {Pereira,  Marcone C.},
     title = {Generic simplicity of eigenvalues for a {Dirichlet} problem of the bilaplacian operator},
     journal = {Electronic journal of differential equations},
     year = {2004},
     volume = {2004},
     zbl = {1134.35302},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a70/}
}