@article{1334386,
  author = {David Penn and S Apell},
  title = {Optical Properties of Small Metal Spheres: Surface Effects},
  year = {1983},
  number = {50},
  month = {1983-04-25 00:04:00},
  publisher = {Physical Review Letters},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=620233},
  language = {en},
}