Multiple solutions for superlinear Klein-Gordon-Maxwell equations

Dong-Lun Wu, Hongxia Lin

In this paper, we consider the following Klein-Gordon-Maxwell equations \begin{eqnarray*} \left\{ \begin{array}{ll} -Δu+ V(x)u-(2ω+ϕ)ϕu=f(x,u)+h(x)&\mbox{in ${\mathbb{R}}^3$},\\ -Δ…