@misc{indiciaed6ca2c4094a9,
  title = {Composition and quality of coals in the Huaibei Coalfield, Anhui, China},
  author = {Lingyun Zheng and Gaisheng Liu and L. Wang and C. L. Chou},
  year = {2008},
  doi = {10.1016/j.gexplo.2007.11.002},
  url = {https://pubs.usgs.gov/publication/70031895},
  note = {Source identifier: 70031895}
}