@article{EJDE_2009__2009__a5,
     author = {Zhuang, Rong-Kun},
     title = {Annulus oscillation criteria for second order nonlinear elliptic differential equations with damping},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2009},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a5/}
}