@misc{indiciae97673ab90624,
  title = {Negative surface-plasmon dispersion coefficient: A physically illustrative, exact formula.},
  author = {PJ Feibelman and KD Tsuei},
  year = {1990},
  doi = {10.1103/physrevb.41.8519},
  url = {https://pubmed.ncbi.nlm.nih.gov/9993180/},
  note = {Source identifier: 9993180}
}