@misc{indiciae6e05c9148ccc,
  title = {Coal-shale interface detection},
  author = {Broussard, P. H. and Burch, J. L. and Drost, E. J. and Stein, R. J.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790017272},
  note = {Source identifier: 19790017272}
}