@misc{indiciae3d92ebad5697,
  title = {Surface-plasmon dispersion relation for the inhomogeneous charge-density medium.},
  author = {OK Harsh and BK Agarwal},
  year = {1989},
  doi = {10.1103/physrevb.39.8150},
  url = {https://pubmed.ncbi.nlm.nih.gov/9947521/},
  note = {Source identifier: 9947521}
}