@misc{indiciaeb5f0b9fb95fb,
  title = {An ultrasonic system for measuring activity.},
  author = {J Haines},
  year = {1974},
  doi = {10.1007/bf02477812},
  url = {https://pubmed.ncbi.nlm.nih.gov/4466998/},
  note = {Source identifier: 4466998}
}