@misc{indiciae41cf7951f9c7,
  title = {Comment on "Retardation in two-photon absorption"},
  author = {CK Au},
  year = {1989},
  doi = {10.1103/physreva.40.7402},
  url = {https://pubmed.ncbi.nlm.nih.gov/9902165/},
  note = {Source identifier: 9902165}
}