@misc{indiciae20a904903819,
  title = {Use of high-resolution ground-penetrating radar in kimberlite delineation},
  author = {J.M. Kruger and A. Martinez and P. Berendsen},
  year = {1997},
  url = {https://pubs.usgs.gov/publication/70019519},
  note = {Source identifier: 70019519}
}