@misc{indiciaeb2a1a76cebee,
  title = {Mineralogy and geochemistry of the No. 6 Coal (Pennsylvanian) in the Junger Coalfield, Ordos Basin, China},
  author = {S. Dai and D. Ren and C. L. Chou and S. Li and Y. Jiang},
  year = {2006},
  doi = {10.1016/j.coal.2005.08.003},
  url = {https://pubs.usgs.gov/publication/70030631},
  note = {Source identifier: 70030631}
}