@misc{indiciae839a0293093c,
  title = {Mapping of coal quality using stochastic simulation and isometric logratio transformation with an application to a Texas lignite},
  author = {Ricardo A. Olea and James A. Luppens},
  year = {2015},
  doi = {10.1016/j.coal.2015.10.003},
  url = {https://pubs.usgs.gov/publication/70188827},
  note = {Source identifier: 70188827}
}