@conference{116351,
  author = {J Gao and J Delos},
  title = {Closed orbits and recurrences in atomic spectra: Patterns of trajectories in integrable systems, ed. by I. Alvarez, C. Cisneros and T.J. Morgan},
  year = {1995},
  month = {1995-01-01},
  publisher = {Atomic and Molecular Physics , Quer{eacute}tero, MX},
  language = {en},
}