@misc{indiciaef09a25577294,
  title = {Free-radical concentrations and other properties of pile-irradiated coals},
  author = {R.A. Friedel and Irving A. Breger},
  year = {1959},
  doi = {10.1126/science.130.3391.1762},
  url = {https://pubs.usgs.gov/publication/70010752},
  note = {Source identifier: 70010752}
}