@conference{5336,
  author = {J. Gao and J. Delos},
  title = {Closed orbits and recurrences in atomic spectra: Patterns of trajectories in integrable systems},
  year = {1994},
  publisher = {World Scientific Publishing Company, Singapore},
  address = {Antigua Hacienda de Galindo, San Juan del Rio, Quer\ etero, Mexico},
  note = {JILA Pub. 5405},
}