@misc{indiciae90eff657c15d,
  title = {An electronic feedback constant flow controller for high volume samplers and air movers.},
  author = {D M Bernstein},
  year = {1979},
  doi = {10.1080/15298667991430370},
  url = {https://pubmed.ncbi.nlm.nih.gov/160196/},
  note = {Source identifier: 160196}
}