Perturbation from symmetry and multiplicity of solutions for elliptic problems with subcritical exponential growth in R^2

We consider the following boundary value problem {-Δu = g(x, u) + f(x, u) x ∈ Ω u = 0 x ∈ ∂Ω where g(x, -ξ) = -g(x,ξ) and g has subcritical exponential growth in ℝ2. Using the method developed by Bolle, we prove that this problem has infinitely many solutions under suitable conditions on the growth of g(u) and f(u).