@article{EJDE_2004__2004__a124,
     author = {Tunc,  Cemil},
     title = {On the instability of certain sixth-order nonlinear differential equations},
     journal = {Electronic journal of differential equations},
     year = {2004},
     volume = {2004},
     zbl = {1075.34047},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a124/}
}