@misc{indiciae47c2c91f4801,
  title = {Mineralogical and compositional characteristics of Late Permian coals from an area of high lung cancer rate in Xuan Wei, Yunnan, China: Occurrence and origin of quartz and chamosite},
  author = {S. Dai and L. Tian and C. L. Chou and Y. Zhou and M. Zhang and L. Zhao and Jingyuan Wang and Z. Yang and H. Cao and D. Ren},
  year = {2008},
  doi = {10.1016/j.coal.2008.09.001},
  url = {https://pubs.usgs.gov/publication/70032397},
  note = {Source identifier: 70032397}
}