TY - JOUR AU - Zhuang, Rong-Kun TI - Annulus oscillation criteria for second order nonlinear elliptic differential equations with damping JO - Electronic Journal of Differential Equations PY - 2009 VL - 2009 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a105/ LA - en ID - EJDE_2009__2009__a105 ER -