@article{1327901,
  author = {David Penn},
  title = {Electron mean free paths for free-electron-like materials},
  year = {1976},
  number = {13},
  month = {1976-06-15 00:06:00},
  publisher = {Physical Review B (Condensed Matter and Materials Physics)},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=620125},
  language = {en},
}