@article{1311641,
  author = {V Crespi and Marvin Cohen and David Penn},
  title = {Anharmonic Phonons and the Isotope Effect in Superconductivity},
  year = {1991},
  number = {43},
  month = {1991-01-01 00:01:00},
  publisher = {Physical Review B (Condensed Matter and Materials Physics)},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=620376},
  language = {en},
}