Uniqueness for Neumann problems for nonlinear elliptic equations

In the present paper we prove uniqueness results for solutions to a class of Neumann boundary value problems whose prototype is --div((1 + |$\mathrm{\nabla }$u| 2) (p–2)/2 $\mathrm{\nabla }$u) – div(c(x)|u| p–2 u) = f in $\mathrm{\Omega }$, (1 + |$\mathrm{\nabla }$u| 2) (p–2)/2 $\mathrm{\nabla }$u + c(x)|u| p–2 u $\times$ n = 0 on $\mathrm{\partial }$$\mathrm{\Omega }$,