@misc{indiciaec05dee30f605,
  title = {Coherence in two-photon down-conversion induced by a laser.},
  author = {ZY Ou and LJ Wang and XY Zou and L Mandel},
  year = {1990},
  doi = {10.1103/physreva.41.1597},
  url = {https://pubmed.ncbi.nlm.nih.gov/9903257/},
  note = {Source identifier: 9903257}
}