@misc{indiciaec96343f56165,
  title = {Two-photon absorption of nonclassical light.},
  author = {J Gea-Banacloche},
  year = {1989},
  doi = {10.1103/physrevlett.62.1603},
  url = {https://pubmed.ncbi.nlm.nih.gov/10039717/},
  note = {Source identifier: 10039717}
}