TY - JOUR AU - Tunc, Cemil TI - On the instability of certain sixth-order nonlinear differential equations JO - Electronic Journal of Differential Equations PY - 2004 VL - 2004 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a124/ LA - en ID - EJDE_2004__2004__a124 ER -