@misc{indiciae5553c2983f7e,
  title = {Nitrogen in Chinese coals},
  author = {D. Wu and J. Lei and B. Zheng and X. Tang and M. Wang and Jiawen Hu and S. Li and B. Wang and R. B. Finkelman},
  year = {2011},
  doi = {10.1007/s11631-011-0506-6},
  url = {https://pubs.usgs.gov/publication/70034025},
  note = {Source identifier: 70034025}
}