@article{FelicettiPedernalesEgusquizaetal.2015,
  author    = {S. Felicetti and J. S. Pedernales and I. L. Egusquiza and G. Romero and L. Lamata and Daniel Braak and E. Solano},
  title     = {Spectral collapse via two-phonon interactions in trapped ions},
  journal   = {Physical Review A},
  volume    = {92},
  number    = {3},
  pages     = {033817},
  doi       = {10.1103/physreva.92.033817},
  year      = {2015},
}