@misc{indiciaeb638d8303467,
  title = {Probes for external counting.},
  author = {C S Bowring},
  year = {1978},
  doi = {10.1088/0031-9155/23/4/423},
  url = {https://pubmed.ncbi.nlm.nih.gov/704682/},
  note = {Source identifier: 704682}
}