@misc{indiciae228323ee9ba7,
  title = {Instrumentation for negative ion detection.},
  author = {M McKeown},
  year = {1980},
  doi = {10.1289/ehp.803697},
  url = {https://pubmed.ncbi.nlm.nih.gov/7428750/},
  note = {Source identifier: 7428750}
}