@misc{indiciaed06f539d9cea,
  title = {Local and nonlocal surface nonlinearities for surface optical second-harmonic generation.},
  author = {P Guyot-Sionnest and YR Shen},
  year = {1987},
  doi = {10.1103/physrevb.35.4420},
  url = {https://pubmed.ncbi.nlm.nih.gov/9941996/},
  note = {Source identifier: 9941996}
}