@misc{indiciaeb882160c90c4,
  title = {Multiphoton ionization in a short-range potential: A nonperturbative approach.},
  author = {SM Susskind and SC Cowley and EJ Valeo},
  year = {1990},
  doi = {10.1103/physreva.42.3090},
  url = {https://pubmed.ncbi.nlm.nih.gov/9904379/},
  note = {Source identifier: 9904379}
}