@article{CammarotoChinniDiBella2007GMJ,
  author  = {Filippo Cammaroto and Antonia Chinnì and Beatrice Di Bella},
  title   = {Multiplicity Results for a Perturbed Nonlinear Schrödinger Equation},
  journal = {Glasgow Mathematical Journal},
  volume  = {49},
  number  = {3},
  pages   = {423--429},
  year    = {2007},
  doi     = {10.1017/S0017089507003850}
}