@misc{indiciaef6ccc2baa9ad,
  title = {A simple bubble-flowmeter with quasicontinuous registration.},
  author = {H Ludt and H D Herrmann},
  year = {1976},
  doi = {10.1007/bf01851729},
  url = {https://pubmed.ncbi.nlm.nih.gov/136034/},
  note = {Source identifier: 136034}
}