@article{CammarotoChinniDiBella2006JNCA,
  author  = {Filippo Cammaroto and Antonia Chinnì and Beatrice Di Bella},
  title   = {Some Multiplicity Results for Certain Nonlinear Problems via Variational Methods},
  journal = {Journal of Nonlinear and Convex Analysis},
  volume  = {7},
  number  = {3},
  pages   = {367--377},
  year    = {2006}
}