@article{Cao Long:1988,
  author  = "V. Cao Long and C. Nguyen Huy",
  title   = "(N-1) - resonant N-photon ionization in the presence of pre-Gaussian field",
  journal = "Acta Physica Polonica A",
  volume  = "Vol. 73",
  number  = "no 5",
  pages   = "779--783",
  year    = "1988",
}