@misc{indiciae64aa6c84c38c,
  title = {The null-point method for measuring the flow rate in a sampling train.},
  author = {S A Roach},
  doi = {10.1080/00028896609342805},
  url = {https://pubmed.ncbi.nlm.nih.gov/5953996/},
  note = {Source identifier: 5953996}
}