@misc{1180161,
  author = {Keith C Roe and Ronald C Wittmann},
  title = {Improved coal interface detector:},
  year = {1982},
  month = {1982-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.82-1663},
  language = {en},
}