@misc{indiciae33f1c039703a,
  title = {Surface vibrational spectroscopy by infrared-visible sum frequency generation.},
  author = {XD Zhu and H Suhr and YR Shen},
  year = {1987},
  doi = {10.1103/physrevb.35.3047},
  url = {https://pubmed.ncbi.nlm.nih.gov/9941799/},
  note = {Source identifier: 9941799}
}