@misc{indiciae5f473fcd02a1,
  title = {Second-harmonic generation from alkali-metal overlayers.},
  author = {A Liebsch},
  year = {1989},
  doi = {10.1103/physrevb.40.3421},
  url = {https://pubmed.ncbi.nlm.nih.gov/9992298/},
  note = {Source identifier: 9992298}
}