@misc{indiciaeeaa08a7a0b35,
  title = {Probing the unknown.},
  author = {R J Post and J M Crampton},
  year = {1987},
  doi = {10.1016/0169-4758(87)90251-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/15462900/},
  note = {Source identifier: 15462900}
}