@misc{indiciae682aaf400b6d,
  title = {Petrography and geochemistry of the Middle Devonian coal from Luquan, Yunnan Province, China},
  author = {S. Dai and D. Han and C. L. Chou},
  year = {2006},
  doi = {10.1016/j.fuel.2005.08.017},
  url = {https://pubs.usgs.gov/publication/70030467},
  note = {Source identifier: 70030467}
}