@misc{indiciae32446eb71283,
  title = {Geochemistry of rare earth elements in Permian coals from the Huaibei Coalfield, China},
  author = {Lingyun Zheng and Gaisheng Liu and C. L. Chou and C. Qi and Y. Zhang},
  year = {2007},
  doi = {10.1016/j.jseaes.2007.06.001},
  url = {https://pubs.usgs.gov/publication/70031377},
  note = {Source identifier: 70031377}
}