@misc{indiciae09c352966828,
  title = {Sequential solvent extraction for the modes of occurrence of selenium in coals of different ranks from the Huaibei Coalfield, China},
  author = {Y. Zhang and Gaisheng Liu and C. L. Chou and L. Wang and Y. Kang},
  year = {2007},
  doi = {10.1186/1467-4866-8-14},
  url = {https://pubs.usgs.gov/publication/70031564},
  note = {Source identifier: 70031564}
}