@article{8664,
  author = {M. Du and J. Delos},
  title = {Effect of closed classical orbits on quantum spectra: Ionization of atoms in a magnetic field},
  year = {1987},
  journal = {Physical Review Letters},
  volume = {58},
  pages = {1731-1733},
  month = {Jan-04-1987},
  issn = {0031-9007},
  url = {http://link.aps.org/doi/10.1103/PhysRevLett.58.1731},
  doi = {10.1103/PhysRevLett.58.1731},
}