@misc{indiciaeef98b7a69adc,
  title = {An ultrasonic bladder-volume sensor.},
  author = {M T Rise and W E Bradley and D A Frohrib},
  year = {1979},
  doi = {10.1109/tbme.1979.326464},
  url = {https://pubmed.ncbi.nlm.nih.gov/544445/},
  note = {Source identifier: 544445}
}