@misc{indiciae8368fdacaa1a,
  title = {Trace element abundances in major minerals of Late Permian coals from southwestern Guizhou province, China},
  author = {Jiahua Zhang and D. Ren and C. Zheng and R. Zeng and C. L. Chou and J. Liu},
  year = {2002},
  doi = {10.1016/s0166-5162(02)00164-7},
  url = {https://pubs.usgs.gov/publication/70024015},
  note = {Source identifier: 70024015}
}