@misc{indiciae83b6d5901291,
  title = {Optical properties of pseudovitrinite; implications for its origin},
  author = {Maria Mastalerz and A. Drobniak},
  year = {2005},
  doi = {10.1016/j.coal.2005.03.019},
  url = {https://pubs.usgs.gov/publication/70029559},
  note = {Source identifier: 70029559}
}