@misc{indiciae5ea575a8a705,
  title = {General considerations on optical second-harmonic generation from surfaces and interfaces.},
  author = {P Guyot-Sionnest and W Chen and YR Shen},
  year = {1986},
  doi = {10.1103/physrevb.33.8254},
  url = {https://pubmed.ncbi.nlm.nih.gov/9938219/},
  note = {Source identifier: 9938219}
}