@misc{indiciae95fa40825edf,
  title = {Retardation in two-photon absorption.},
  author = {XL Yang and FT Chan and M Lieber},
  year = {1989},
  doi = {10.1103/physreva.39.5422},
  url = {https://pubmed.ncbi.nlm.nih.gov/9901108/},
  note = {Source identifier: 9901108}
}